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Depopulation of the Great Plains

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Abandoned gas station west of North Platte, Nebraska

The depopulation of the Great Plains refers to the large-scale migration of people from rural areas of the Great Plains of the United States to more urban areas and to the east and west coasts during the 20th century. This phenomenon of rural-to-urban migration has occurred to some degree in most areas of the United States, but has been especially pronounced in the Great Plains states, including Texas, Oklahoma, Kansas, Nebraska, South Dakota, North Dakota, Montana, Wyoming, Colorado, and New Mexico. Many Great Plains counties have lost more than 60 percent of their former populations.

Depopulation began in the early 1900s, accelerated in the Dust Bowl years of the 1930s, and has generally continued through the national census in 2010. The population decline has been broadly attributed to numerous factors, especially changes in agricultural practices, rapid improvements in urban transit and regional connectivity, and a declining rural job market.

Geography

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The Great Plains of the United States

Definitions vary as to what land comprises the Great Plains. The entire states of Kansas, Nebraska, South Dakota, and North Dakota are often considered part of the Great Plains. The Great Plains extend to parts of six additional states: Texas, Oklahoma, New Mexico, Colorado, Wyoming, and Montana. The eastern boundary is about 97 degrees W longitude and the Plains extend westward to the Rocky Mountains and southward from the border with Canada to the approximate latitude of Austin, Texas.[1] A somewhat more restrictive definition by the U.S. Census Bureau gives a total area of the Great Plains in the United States as 533,100 square miles (1,381,000 km2), 18 percent of the area of the entire United States.[2]

The Great Plains are distinguished by generally flat land and a natural vegetation cover consisting mostly of expansive grasslands. The eastern part of the Great Plains is dominated by agriculture, with wheat being the most common and important crop. The western part is more arid and is primarily used for grazing cattle and irrigated agriculture.

Population history

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Large-scale settlement of the Great Plains by farmers and ranchers began with the end of the Civil War in 1865. By the late 1870s the Plains Indians had been defeated militarily and were largely confined to reservations. Drawn by the free land made available by the Homestead Act, pioneer families quickly settled the region such that nearly all of the arable land was privately owned or on Indian reservations by 1900.

The purple areas on the map indicate counties losing population between 2000 and 2010. Most are on the Great Plains.

The initial rush to settle the Great Plains by hundreds of thousands of farmers and ranchers has been reversed because of several factors. Perhaps the most significant reasons have been economic. Over the course of the 20th century, farm economies saw dramatic shifts from small-scale family subsistence farming to larger commercial farms utilizing more equipment and less labor.[3] Many family farms proved to be too small to survive. Farmers also used farming techniques which were unsuited to the dry, windy climate and the frequent droughts of the Great Plains. This became manifest during the Dust Bowl years of the 1930s, in which rural flight from the Great Plains accelerated, although the decline in population of some counties had begun as early as 1900.[4] Better roads and the automobile permitted many farmers to live in larger towns and cities rather than on the farm itself. While urban areas on the Great Plains more than doubled in population, thousands of small towns and communities disappeared. Two-thirds of counties lost some part of their population between the early 1900s and the 2010 census, and, as the table below demonstrates, many rural counties lost more than 60 percent of their population. A few counties lost more than 80 percent of their population. Population density of some Great Plains counties dipped below two persons per square mile.[5][6][7]

Governments have tried a variety of methods to stem the outflow of population from rural areas in the Great Plains. Some towns have offered free building lots to prospective residents, but the program has met with only limited success. The fundamental problem appears to be the few employment opportunities available in these small and isolated communities.[8]

The population decline has led to proposals to return the land to its natural state and under public ownership. The Buffalo Commons proposal calls for large portions of the drier regions of the Great Plains to be returned to their original condition as pasture land for American bison and other plains animals.[9]

Counties with large population losses

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The following Great Plains counties lost more than 60 percent of their population from the census year when they attained their highest population until 2020.

State and county name Area in square miles (km sq) (includes both land and water area) Greatest population (census year) 2020 population Percentage decline in population 2020 population density per sq. mi
Colorado
Baca 2,557 square miles (6,620 km2) 10,570 (1930) 3,506 -66.83% 1.37
Huerfano 1,593 square miles (4,130 km2) 17,062 (1930) 6,820 -60.03% 4.28
Kiowa 1,786 square miles (4,630 km2) 3,786 (1930) 1,446 -61.81% 0.81
Las Animas 4,775 square miles (12,370 km2) 38,975 (1930) 14,555 -62.66% 3.05
Iowa
Adams 426 square miles (1,100 km2) 13,601 (1900) 3,704 -72.77% 8.69
Fremont 517 square miles (1,340 km2) 18,546 (1900) 6,605 -62.58% 12.78
Monroe 434 square miles (1,120 km2) 25,429 (1900) 7,577 -70.20% 17.46
Ringgold 539 square miles (1,400 km2) 15,325 (1900) 4,663 -69.57% 8.65
Taylor 535 square miles (1,390 km2) 18,784 (1900) 5,896 -68.61% 11.02
Wayne 527 square miles (1,360 km2) 17,491 (1900) 6,495 -62.87% 12.32
Kansas
Chase 778 square miles (2,020 km2) 8,246 (1900) 2,572 -68.81% 3.31
Chautauqua 645 square miles (1,670 km2) 12,297 (1890) 3,379 -72.52% 5.24
Cheyenne 1,021 square miles (2,640 km2) 6,948 (1930) 2,616 -62.35% 2.56
Clark 977 square miles (2,530 km2) 4,989 (1920) 1,991 -60.09% 2.04
Comanche 790 square miles (2,000 km2) 5,302 (1920) 1,689 -68.14% 2.14
Decatur 894 square miles (2,320 km2) 9,234 (1900) 2,764 -70.07% 3.09
Edwards 622 square miles (1,610 km2) 7,295 (1930) 2,907 -60.15% 4.67
Elk 650 square miles (1,700 km2) 12,216 (1890) 2,483 -79.67% 3.82
Graham 899 square miles (2,330 km2) 8,700 (1910) 2,415 -72.24% 2.69
Greenwood 1,153 square miles (2,990 km2) 19,235 (1930) 6,016 -68.72% 5.22
Harper 803 square miles (2,080 km2) 14,748 (1910) 5,485 -62.81% 6.83
Jewell 914 square miles (2,370 km2) 19,420 (1900) 2,932 -84.90% 3.21
Kiowa 723 square miles (1,870 km2) 6,174 (1910) 2,460 -60.16% 3.40
Lincoln 720 square miles (1,900 km2) 10,142 (1910) 2,939 -71.02% 4.08
Mitchell 719 square miles (1,860 km2) 15,037 (1890) 5,796 -61.46% 8.06
Ness 1,075 square miles (2,780 km2) 8,358 (1930) 2,687 -67.85% 2.50
Osborne 864 square miles (2,240 km2) 12,827 (1910) 3,500 -72.71% 4.05
Phillips 895 square miles (2,320 km2) 14,442 (1900) 4,981 -65.51% 5.57
Rawlins 1,070 square miles (2,800 km2) 6,790 (1920) 2,561 -62.28% 2.39
Republic 720 square miles (1,900 km2) 18,248 (1900) 4,674 -74.39% 6.49
Rush 718 square miles (1,860 km2) 9,093 (1930) 2,956 -67.49% 4.12
Smith 897 square miles (2,320 km2) 16,384 (1900) 3,570 -78.21% 3.98
Stafford 795 square miles (2,060 km2) 12,510 (1910) 4,072 -67.45% 5.12
Washington 899 square miles (2,330 km2) 21,963 (1900) 5,530 -74.82% 6.15
Woodson 505 square miles (1,310 km2) 10,022 (1900) 3,115 -68.92% 6.17
Minnesota
Kittson 1,104 square miles (2,860 km2) 10,717 (1940) 4,207 -60.75% 3.81
Red Lake 432 square miles (1,120 km2) 12,195 (1900) 3,935 -67.73% 9.11
Missouri
Atchison 550 square miles (1,400 km2) 16,501 (1900) 5,305 -67.85% 9.65
Carroll 701 square miles (1,820 km2) 26,455 (1900) 8,495 -67.89% 12.12
Chariton 767 square miles (1,990 km2) 26,826 (1900) 7,408 -72.38% 9.66
Daviess 569 square miles (1,470 km2) 21,325 (1900) 8,430 -60.47% 14.82
Gentry 492 square miles (1,270 km2) 20,554 (1900) 6,162 -70.02% 12.52
Harrison 726 square miles (1,880 km2) 24,398 (1900) 8,157 -66.57% 11.24
Holt 470 square miles (1,200 km2) 17,083 (1900) 4,223 -75.28% 8.99
Knox 507 square miles (1,310 km2) 13,501 (1890) 3,744 -72.27% 7.38
Mercer 455 square miles (1,180 km2) 14,706 (1900) 3,538 -75.94% 7.78
Putnam 520 square miles (1,300 km2) 16,668 (1900) 4,681 -71.92% 9.00
Schuyler 308 square miles (800 km2) 11,249 (1890) 4,032 -64.16% 13.09
Scotland 439 square miles (1,140 km2) 13,232 (1900) 4,716 -64.36% 10.74
Shelby 502 square miles (1,300 km2) 16,167 (1900) 6,103 -62.25% 12.16
Sullivan 652 square miles (1,690 km2) 20,282 (1900) 5,999 -70.42% 9.20
Worth 267 square miles (690 km2) 9,832 (1900) 1,973 -79.93% 7.39
Montana
Carter 3,348 square miles (8,670 km2) 4,136 (1930) 1,415 -65.79% 0.42
Chouteau 3,997 square miles (10,350 km2) 17,191 (1910) 5,895 -65.71% 1.47
Daniels 1,426 square miles (3,690 km2) 5,553 (1930) 1,661 -70.09% 1.16
Garfield 4,847 square miles (12,550 km2) 5,368 (1920) 1,173 -78.15% 0.24
Golden Valley 1,176 square miles (3,050 km2) 2,126 (1930) 823 -61.29% 0.70
Judith Basin 1,871 square miles (4,850 km2) 5,238 (1930) 2,023 -61.38% 1.08
McCone 2,683 square miles (6,950 km2) 4,790 (1930) 1,729 -65.21% 0.64
Musselshell 1,871 square miles (4,850 km2) 12,030 (1930) 4,730 -60.68% 2.53
Petroleum 1,674 square miles (4,340 km2) 2,045 (1930) 496 -75.75% 0.30
Prairie 1,743 square miles (4,510 km2) 3,941 (1930) 1,088 -72.39% 0.62
Sheridan 1,706 square miles (4,420 km2) 13,847 (1920) 3,539 -74.44% 2.07
Treasure 984 square miles (2,550 km2) 1,990 (1920) 762 -61.71% 0.77
Wheatland 1,428 square miles (3,700 km2) 5,619 (1920) 2,069 -63.18% 1.45
Wibaux 890 square miles (2,300 km2) 3,113 (1920) 937 -69.90% 1.05
Nebraska
Arthur 718 square miles (1,860 km2) 1,412 (1920) 434 -69.26% 0.60
Banner 746 square miles (1,930 km2) 2,435 (1890) 674 -72.32% 0.90
Blaine 714 square miles (1,850 km2) 1,778 (1920) 431 -75.76% 0.60
Boone 687 square miles (1,780 km2) 14,738 (1930) 5,379 -63.50% 7.83
Boyd 545 square miles (1,410 km2) 8,826 (1910) 1,810 -79.49% 3.32
Clay 574 square miles (1,490 km2) 16,310 (1890) 6,104 -62.58% 10.63
Custer 2,576 square miles (6,670 km2) 26,407 (1920) 10,545 -60.07% 4.09
Dundy 921 square miles (2,390 km2) 5,610 (1930) 1,654 -70.52% 1.80
Fillmore 577 square miles (1,490 km2) 15,087 (1900) 5,551 -63.21% 9.62
Franklin 576 square miles (1,490 km2) 10,303 (1910) 2,889 -71.96% 5.02
Frontier 980 square miles (2,500 km2) 8,781 (1900) 2,519 -71.31% 2.57
Furnas 721 square miles (1,870 km2) 12,373 (1900) 4,636 -62.53% 6.43
Garden 1,731 square miles (4,480 km2) 5,099 (1930) 1,874 -63.25% 1.08
Gosper 463 square miles (1,200 km2) 5,301 (1900) 1,893 -64.29% 4.09
Greeley 571 square miles (1,480 km2) 8,685 (1920) 2,188 -74.81% 3.83
Harlan 574 square miles (1,490 km2) 9,578 (1910) 3,073 -67.92% 5.35
Hayes 713 square miles (1,850 km2) 3,603 (1930) 856 -76.24% 1.20
Hitchcock 718 square miles (1,860 km2) 7,269 (1930) 2,616 -64.01% 3.64
Keya Paha 774 square miles (2,000 km2) 3,594 (1920) 769 -78.60% 0.99
Logan 571 square miles (1,480 km2) 2,014 (1930) 716 -64.45% 1.25
Loup 571 square miles (1,480 km2) 2,188 (1910) 607 -72.26% 1.06
McPherson 860 square miles (2,200 km2) 2,470 (1910) 399 -83.85% 0.46
Nance 448 square miles (1,160 km2) 8,926 (1910) 3,380 -62.13% 7.54
Nuckolls 576 square miles (1,490 km2) 13,236 (1920) 4,095 -69.06% 7.11
Pawnee 433 square miles (1,120 km2) 11,770 (1900) 2,544 -78.39% 5.88
Richardson 555 square miles (1,440 km2) 19,826 (1930) 7,781 -60.30% 14.02
Rock 1,012 square miles (2,620 km2) 3,977 (1940) 1,262 -68.27% 1.25
Sherman 572 square miles (1,480 km2) 9,122 (1930) 2,959 -67.56% 5.17
Sioux 2,067 square miles (5,350 km2) 5,599 (1910) 1,135 -79.73% 0.55
Thayer 575 square miles (1,490 km2) 14,775 (1910) 4,913 -66.75% 8.54
Thomas 714 square miles (1,850 km2) 1,773 (1920) 669 -62.27% 0.94
Webster 575 square miles (1,490 km2) 12,008 (1910) 3,411 -71.59% 5.93
Wheeler 576 square miles (1,490 km2) 2,531 (1920) 774 -70.60% 1.34
New Mexico
Harding 2,126 square miles (5,510 km2) 4,421 (1930) 657 -85.14% 0.31
Mora 1,934 square miles (5,010 km2) 13,915 (1920) 4,189 -69.90% 2.17
Union 3,831 square miles (9,920 km2) 16,680 (1930) 4,079 -75.55% 1.06
North Dakota
Adams 989 square miles (2,560 km2) 6,343 (1930) 2,200 -65.32% 2.22
Billings 1,153 square miles (2,990 km2) 3,126 (1920) 945 -69.77% 0.82
Bottineau 1,697 square miles (4,400 km2) 17,295 (1910) 6,379 -63.12% 3.76
Burke 1,129 square miles (2,920 km2) 9,998 (1930) 2,201 -77.99% 1.95
Cavalier 1,510 square miles (3,900 km2) 15,659 (1910) 3,704 -76.35% 2.45
Divide 1,294 square miles (3,350 km2)} 6,015 (1910) 2,195 -63.51% 1.70
Eddy 644 square miles (1,670 km2) 6,493 (1920) 2,347 -63.85% 3.64
Emmons 1,555 square miles (4,030 km2) 12,467 (1930) 3,301 -73.52% 2.12
Golden Valley 1,002 square miles (2,600 km2) 4,832 (1920) 1,736 -64.07% 1.73
Grant 1,666 square miles (4,310 km2) 10,134 (1930) 2,301 -77.29% 1.38
Griggs 716 square miles (1,850 km2) 7,402 (1920) 2,306 -68.85% 3.22
Hettinger 1,134 square miles (2,940 km2) 8,796 (1930) 2,489 -71.70% 2.19
Kidder 1,433 square miles (3,710 km2) 8,031 (1930) 2,394 -70.19% 1.67
LaMoure 1,151 square miles (2,980 km2) 11,517 (1930) 4,093 -64.46% 3.56
Logan 1,011 square miles (2,620 km2) 8,089 (1930) 1,876 -76.81% 1.86
McHenry 1,912 square miles (4,950 km2) 17,627 (1910) 5,345 -69.68% 2.80
McIntosh 995 square miles (2,580 km2) 9,621 (1930) 2,530 -73.70% 2.54
Nelson 1,009 square miles (2,610 km2) 10,312 (1920) 3,015 -70.76% 2.99
Pembina 1,121 square miles (2,900 km2) 17,869 (1900) 6,844 -61.70% 6.11
Renville 893 square miles (2,310 km2) 7,840 (1910) 2,282 -70.89% 2.56
Sargent 867 square miles (2,250 km2) 9,655 (1920) 3,862 -60.00% 4.45
Sheridan 1,006 square miles (2,610 km2) 8,103 (1910) 1,265 -84.39% 1.26
Slope 1,219 square miles (3,160 km2) 4,940 (1920) 706 -85.71% 0.58
Steele 715 square miles (1,850 km2) 7,616 (1910) 1,798 -76.39% 2.51
Towner 1,041 square miles (2,700 km2) 8,963 (1910) 2,162 -75.88% 2.08
Wells 1,290 square miles (3,300 km2) 13,285 (1930) 3,982 -70.03% 3.09
Oklahoma
Alfalfa 881 square miles (2,280 km2) 18,138 (1910) 5,699 -68.58% 6.47
Beaver 1,818 square miles (4,710 km2) 14,048 (1920) 5,049 -64.06% 2.78
Coal 521 square miles (1,350 km2) 18,406 (1920) 5,266 -71.39% 10.11
Cotton 642 square miles (1,660 km2) 16,679 (1920) 5,527 -66.86% 8.61
Dewey 1,008 square miles (2,610 km2) 14,132 (1910) 4,484 -68.27% 4.45
Ellis 1,232 square miles (3,190 km2) 15,375 (1910) 3,749 -75.62% 3.04
Grant 1,004 square miles (2,600 km2) 18,760 (1910) 4,169 -77.78% 4.15
Greer 644 square miles (1,670 km2) 17,922 (1900) 5,491 -69.36% 8.53
Harmon 539 square miles (1,400 km2) 13,834 (1930) 2,488 -82.02% 4.62
Harper 1,041 square miles (2,700 km2) 8,189 (1910) 3,272 -60.04% 3.14
Jefferson 774 square miles (2,000 km2) 17,764 (1920) 5,337 -69.96% 6.90
Kiowa 1,031 square miles (2,670 km2) 29,630 (1930) 8,509 -71.28% 8.25
Okfuskee 629 square miles (1,630 km2) 29,016 (1930) 11,310 -61.02% 17.98
Roger Mills 1,146 square miles (2,970 km2) 14,164 (1930) 3,442 -75.70% 3.00
Seminole 640 square miles (1,700 km2) 79,621 (1930) 23,556 -70.41% 36.81
Tillman 879 square miles (2,280 km2) 24,390 (1930) 6,968 -71.43% 7.93
Washita 1,009 square miles (2,610 km2) 29,435 (1930) 10,924 -62.89% 10.83
South Dakota
Aurora 713 square miles (1,850 km2) 7,246 (1920) 2,747 -62.09% 3.85
Campbell 771 square miles (2,000 km2) 5,629 (1930) 1,377 -75.54% 1.79
Clark 967 square miles (2,500 km2) 11,136 (1920) 3,837 -65.54 3.97
Day 1,091 square miles (2,830 km2) 15,194 (1920) 5,449 -64.14% 4.99
Douglas 434 square miles (1,120 km2) 7,236 (1930) 2,835 -60.82% 6.53
Faulk 1,006 square miles (2,610 km2) 6,895 (1930) 2,125 -69.18% 2.11
Gregory 1,054 square miles (2,730 km2) 13,061 (1910) 3,994 -69.42% 3.79
Hand 1,440 square miles (3,700 km2) 9,485 (1930) 3,145 -66.84% 2.18
Harding 2,678 square miles (6,940 km2) 4,228 (1910) 1,311 -68.99% 0.49
Hyde 866 square miles (2,240 km2) 3,690 {1930) 1,262 -65.80% 1.46
Jerauld 533 square miles (1,380 km2) 6,338 (1920) 1,663 -73.76% 3.12
Jones 971 square miles (2,510 km2) 3,177 (1930) 917 -71.14% 0.94
Lyman 1,707 square miles (4,420 km2) 10,848 (1910) 3,718 -65.73% 2.18
McPherson 1,152 square miles (2,980 km2) 8,774 (1930) 2,411 -72.52% 2.09
Mellette 1,311 square miles (3,400 km2) 5,293 (1930) 1,918 -63.76% 1.46
Miner 572 square miles (1,480 km2) 8,560 (1920) 2,298 -73.15% 4.02
Perkins 2,891 square miles (7,490 km2) 11,348 (1910) 2,835 -75.02% 0.98
Sanborn 570 square miles (1,500 km2) 7,877 (1920) 2,330 -70.42% 4.09
Spink 1,510 square miles (3,900 km2) 15,981 (1910) 6,361 -60.20% 4.21
Stanley 1,517 square miles (3,930 km2) 14,975 (1910) 2,980 -80.10% 1.96
Sully 1,070 square miles (2,800 km2) 3,852 (1930) 1,446 -62.46% 1.35
Texas
Briscoe 902 square miles (2,340 km2) 5,590 (1930) 1,435 -74.33% 1.59
Coleman 1,281 square miles (3,320 km2) 23,669 (1930) 7,684 -67.54% 6.00
Cochran 775 square miles (2,010 km2) 6,417 (1960) 2,547 -60.31% 3.29
Collingsworth 919 square miles (2,380 km2) 14,461 (1930) 2,652 -81.66% 2.89
Cottle 902 square miles (2,340 km2) 9,395 (1930) 1,380 -85.31% 1.53
Dickens 905 square miles (2,340 km2) 8,601 (1930) 1,770 -79.42% 1.96
Donley 933 square miles (2,420 km2) 10,262 (1930) 3,258 -68.25% 3.49
Eastland 932 square miles (2,410 km2) 58,565 (1920) 17,725 -69.73% 19.02
Edwards 2,120 square miles (5,500 km2) 3,768 (1910) 1,422 -62.26% 0.67
Fisher 902 square miles (2,340 km2) 13,565 (1930) 3,672 -72.93% 4.07
Foard 708 square miles (1,830 km2) 6,315 (1930) 1,095 -82.66% 1.55
Hall 904 square miles (2,340 km2) 16,966 (1930) 2,825 -83.35% 3.13
Hardeman 697 square miles (1,810 km2) 14,532 (1930) 3,549 -75.58% 5.09
Haskell 910 square miles (2,400 km2) 16,669 (1930) 5,416 -67.51% 5.95
Kent 903 square miles (2,340 km2) 3,851 (1930) 753 -80.45% 0.83
King 913 square miles (2,360 km2) 1,193 (1930) 265 -77.79% 0.29
Knox 855 square miles (2,210 km2) 11,368 (1930) 3,353 -70.50% 3.92
Loving 677 square miles (1,750 km2) 285 (1940) 64 -77.54% 0.09
Motley 990 square miles (2,600 km2) 6,812 (1930) 1,063 -84.40% 1.07
Red River 1,057 square miles (2,740 km2) 35,829 (1920) 11,587 -67.66% 10.96
Stonewall 920 square miles (2,400 km2) 5,667 (1930) 1,245 -78.03% 1.35
Terrell 2,358 square miles (6,110 km2) 3,189 (1950) 760 -76.17% 0.32
Throckmorton 915 square miles (2,370 km2) 5,253 (1930) 1,440 -72.59% 1.57
Wheeler 915 square miles (2,370 km2) 15,555 (1930) 4,990 -67.92% 5.45
Wyoming
Niobrara 2,628 square miles (6,810 km2) 6,321 (1920) 2,467 -60.97% 0.94

Sources: [1], accessed 10 June 2024; [2]. accessed 24 May 2022

See also

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References

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  1. ^ Wishart, David. 2004. "The Great Plains Region", In: Encyclopedia of the Great Plains, Lincoln: University of Nebraska Press, pp. xiii-xviii. ISBN 0-8032-4787-7
  2. ^ Wilson, S.G., "Population Dynamics of the Great Plains, 1950-2007" Archived 2022-01-19 at the Wayback Machine, accessed 7 May 2013
  3. ^ Cronon, William (1991). Nature's Metropolis: Chicago and the Great West. New York: Norton.
  4. ^ Cooper, Michael L. (2004). Dust to eat: drought and depression in the 1930s. New York: Clarion.
  5. ^ "Free land fails to draw new homesteaders to Kansas towns" Archived 2013-11-28 at the Wayback Machine, McClatchy, March 15, 2013, accessed 6 May 2013
  6. ^ "Population flight from growing desert of central Texas". ThinkProgress. Archived from the original on 2013-09-28. Retrieved 2013-07-19.
  7. ^ Samuels, David (March–April 2011). "Where the Buffalo Roam". Mother Jones. Archived from the original on 2020-09-19. Retrieved 2020-09-25.
  8. ^ accessed 6 May 2013
  9. ^ Deborah Epstein Popper and Frank J. Popper, "Great Plains: From Dust to Dust" Archived 2013-04-29 at the Wayback Machine, Planning, December 1987