Artist dead more than 100 years; images from 1932 book, copyright of which was not renewed in 28th year; non-renewal confirmed with Minnesota Historical Society. (Book since republished in 1986 as paperback: [1], ISBN0-87351-195-6.)
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.