He is best known for compiling two authoritative coin
price guides,
A Handbook of United States Coins (also known as the "Blue Book", published in 1942) and
A Guide Book of United States Coins (or the "Red Book" or
The Official Red Book), first published in 1946. Yeoman also wrote A
Catalogue of Modern World Coins in 1957 also known as the "brown book", where his Yeoman numbering system was popularly accepted. Whitman bought the rights to Coins of the World Catalogues from the estate of Wayte Raymond. As the size reached a theoretical limit, the foreign series was split off into a second book. Yeoman wrote
Current Coins of the World as the second in that series. R. S. Yeoman retired in 1970, and was succeeded by his assistant,
Kenneth Bressett. Yeoman (with Bressett) is still listed as the author of each edition of the books. Yeoman served on the
American Numismatic Association Board of Governors from 1946–1951, and in 1964 was a member of the United States Assay Commission. He also served as President of the Racine Numismatic Society. He co-founded the Numismatists of Wisconsin and was also a charter member of the Numismatic Literary Guild, among his membership in 20 different numismatic organizations. ==Later life==