Uncommon staple-bound NASA manual entitled "Skylab, Final Flight Mission Rules, Revision B," deriving from the personal collection of a longtime NASA Engineer and Flight Director for the mission. Dated July 16, 1973, and issued as "MSC-07191," this document contains revision B to the final flight mission rules for SL-3 and 4, and consists of various pages for the following revised sections: Introduction, Purpose, and Responsibilities, Ground Instruction Requirements, Trajectory and Guidance, Launch Vehicle, SWS EGIL, SWS Guidance and Navigation, Communications, Apollo Telescope Mount Experiments, Space Environment, Aeromedical/Biomedical Experiments, Corollary, Earth Resources Experiments Package, and Extravehicular Activity. In very good to fine condition, with the front cover detached but present.