Manuscripts
Rigid Rotor Helicopters. XH-51, 1970, 1973, n.d
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Originally Located in Other Series within Collection. Subject Files Series. Rigid Rotor Helicopters. XH-51, Box 78(2), n.d
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Rigid Rotor Helicopters. AH-56 Cheyenne. Advanced Aerial Fire Support System (AAFSS). Miscellaneous, 1966-1968, 1970-1972, 1975, 1977, n.d
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