Spiral-bound manual produced by General Electric entitled "Apollo Fuel Cell Thermal Model Handbook (Block II)," 9 x 11, 87 pages, consisting of several schematic diagrams and figures, plus about 70 pages of data tables. Includes a fold-out "Block II Spacecraft Fuel Cell Flow Schematic" and fold-out diagram of the "Block II Apollo Fuel Cell & Heat Rejection System," figures depicting the coolant gas bay control cluster, inert gas bay control cluster, reactant gas bay control cluster, component bays, and fuel cell module. Tables include fluid lump descriptions and data, tube lump descriptions and data, and structural lump descriptions and data. Stamped "00011" on the front cover. In fine condition, with light foxing to the covers.