By Bartlett F. D.   in Journal of the American Helicopter Society

ISSN:2161-6027|28|1|49-55

AHS International‎(1983)‎

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By Bartlett F. D.   Flannelly W. G.   in Journal of the American Helicopter Society

ISSN:2161-6027|24|2|10-18

AHS International‎(1979)‎

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