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Biography of Dr. Percy Lavon Julian (1899-2022): Greatest African-American Chemist of the 20th Century is written by William Shurtleff; Akiko Aoyagi and published by Soyinfo Center. It's available with International Standard Book Number or ISBN identification 1948436817 (ISBN 10) and 9781948436816 (ISBN 13).
For the best story (enactment) of the life of Dr. Percy Lavon Julian, the greatest African-American chemist of the 20th century, google PBS NOVA "Forgotten Genius" YouTube. The present book is a good bibliography and sourcebook, with 48 photographs and illustrations, many in color.