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File:Americana 1920 Mineralogy - Valuable Minerals.jpg

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Description
English: A color chart showing ten minerals corresponding to the raw forms of commercially valuable metals, as well as a sample of coal and iron pyrite.
Date
Source Encyclopedia Americana, v. 19, 1920, facing p. 166.
Author F. E. Wright
Permission
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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Americana_1920_Mineralogy_-_Valuable_Minerals.jpg

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current14:59, 5 October 2012Thumbnail for version as of 14:59, 5 October 20121,415 × 2,127 (385 KB)Bob Burkhardt{{Information |Description={{en|A color chart showing ten minerals corresponding to the raw forms of commercially valuable metals, as well as a sample of coal and iron pyrite.}} |Source=''Encyclopedia Americana'', v. 19, 1920, facing p. 166. |Date=1912...

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