Jacobs, N. & C. Vermeule. Japanese Coinage. (New York, 1972).
This is the first comprehensive book on Japanese coinage ever published in English. The authors were Lieutenants in the US Military stationed in Japan during occupation from 1945 to 1952. They had access to the treasury of Japan and to all of the coins ever minted there. This gave them access to every kind of coin. Their work has been much copied but has never been exceeded. 151 pages.