Uncommon and desirable pocket-sized spiral-bound manual entitled "Apollo Portable Life Support Systems" by NASA subcontractor Hamilton Standard, 3.75 x 5.5, 146 pages, with numerous descriptions, fold-out schematics, and diagrams associated with the Portable Life Support System (PLSS), Oxygen Purge System (OPS), Buddy Secondary Life Support System (BSLSS), and Pressure Control Valve System (PCV). In fine condition.
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