A Guide Book of Peace Dollars is the 13th entry in Whitman''s Bowers Series of numismatic references. It covers every date and mintmark of America''s last 90% silver dollar, which began as a commemorative of peace after the tribulations of World War One. The book also studies the mysterious 1964-D Peace Dollar, as well as proofs, patterns, trial pieces, errors and misstrikes, countermarks, die varieties, and famous collections.