[Preprints presented at the 28th annual national forum of the American Helicopter Society, Washington, D.C., May 1972]
Annual national forum of the American Helicopter Society ; 28 ; 1972 ; Washington, DC Annual national forum of the American Helicopter Society ; 28 (Washington, DC) : 1972.05.
1972
Getr. Zählung
Ill., graph. Darst
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