Apollo 13 "Guidance and Navigation Summary" manual by Delco Electronics, used by MIT engineer George Silver, 5.5 x 8.5, annotated on the top and bottom textblock edges, "G. L. Silver." The manual has sections on "CM Software," "LM Software," "ASPO 45 CRT Displays," "Launch and Burn Schedule," "Burn Perturbations," and "Hardware," and contains numerous diagrams, instructions, lists, and code definitions related to the guidance and navigation systems used on the aborted Apollo 13 lunar landing mission. There are several annotations inside made during the mission, especially in the section pertaining to the IMU. In fine condition, with light wear from use. From the Don Eyles Apollo Computer Collection.
