NASA report titled ''Results of the Project Mercury Ballistic and Orbital Chimpanzee Flights'', referring to Mercury-Redstone 2 and Mercury-Atlas 5, the only two U.S. space flights carrying chimpanzees. Interesting report runs 71pp. with all details of the chimps' successful flights, including their task performance and physiological monitoring. Also with numerous photos of the chimps during training and in the spacecraft. Measures 7.875'' x 10.25''. Very good plus condition.