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Hardesty, Von, 1939-
May 1993
National Air and Space Museum Archives
Galya Bojkova and Sergei Zhekovm Bulgaria's Air Force, a special issue of Bulgarian Military Review, May 1993; English text by Lyubomir Gigov and Katerina Pavlova.
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Russian Aeronautical Collection, ACC. 2006-0034, National Air and Space Museum, Smithsonian Institution.
Archival materials
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