By Marner Gene R.   Pruyn Richard R.   in Journal of the American Helicopter Society

ISSN:2161-6027|28|3|71-78

AHS International‎(1983)‎

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By Harris Franklin D.   Pruyn Richard R.   in Journal of the American Helicopter Society

ISSN:2161-6027|13|2|27-48

AHS International‎(1968)‎

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By Pruyn Richard R.   Windolph George W.   in Journal of the American Helicopter Society

ISSN:2161-6027|24|2|4-9

AHS International‎(1979)‎

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By Pruyn Richard R.   Taylor Robert B.   in Journal of the American Helicopter Society

ISSN:2161-6027|16|4|2-8

AHS International‎(1971)‎

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