casa early conceived the idea of producing an intelligence manual for each of the japanese prefectures. the purpose of the manual was to provide the military government officer with a single volume of information, not elsewhere available in organized form, of a local and regional nature. oss was asked to provide research materials of a classified nature, expert direction and supervision of research methods and techniques, and final editing and approval of each manual. in addition, a map packet was to constitute an integral part of each manual. each map-packet was to contain 20 to 30 maps selected by oss, covering the prefecture and its parts, and was also to include a map made especially for military government. oss was to procure maps already produced from its own collection, from the hydrographic office, g-2, and army map service. the map, which was to be especially made for military government, was to be produced by casa officers, making base maps and overlays, and oss/washington was to care for drafting and reproduction.