Walker, John, A Catalogue of the Arab-Sassanian Coins in the British Museum: Volume I, London, 1967 (reprint of the 1941 original), 404 pages, 40 plates, hardcover with dust jacket. The earliest Islamic coinage, including Arab-Byzantine, Arab-Ephthalite, Arab-Bukharan and Tabaristan. It has complete coin descriptions, great indices and decent photographic plates. The best single reference, although there have been many discoveries since.
