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History of Soybeans and Soyfoods in Iowa (1854-2021) is written by William Shurtleff; Akiko Aoyagi and published by Soyinfo Center. It's available with International Standard Book Number or ISBN identification 1948436469 (ISBN 10) and 9781948436465 (ISBN 13).
The world's most comprehensive, well documented, and well illustrated book on this subject. With extensive subject and geographic index. 325 photographs and illustrations - many color. Free of charge in digital PDF format.