By Jonnalagadda V. R. P.   Pierce G. Alvin   in Journal of the American Helicopter Society

ISSN:2161-6027|30|2|68-70

AHS International‎(1985)‎

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By Hodges Dewey H.   Peters David A.   Pierce G. Alvin   Jonnalagadda V. R. P.   in Journal of the American Helicopter Society

ISSN:2161-6027|31|3|70-71

AHS International‎(1986)‎

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