Buckingham, Earle Manual of Gear Design: Section 1, 2 & 3 (0831131160)
These manuals conveniently gather together the necessary information required for solving a majority of gear problems. The first section contains tables and information on calculating gear rations, as well as tables of factors and involute functions. The second section cover subjects on spur and internal gears, while section three focuses on information pertaining to helical and spiral gears.