LEM, Lunar Excursion Module Familiarization Manual. Grumman Aircraft Engineering Corp., 15 October 1965. 8.5 x 11 in. with spiral binding. A comprehensive overview of the LEM including mission description, structures, operational subsystems, prelaunch operations, and ground support equipment with several long fold-out pages covering flight profiles, control panels, engine, and other systems. The name LEM was later shorten to just Lunar Module (LM).