By Popelka David   Sheffler Marc   Bilger Jim   in Journal of the American Helicopter Society

ISSN:2161-6027|32|2|21-33

AHS International‎(1987)‎

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By Gabel Richard   Sheffler Marc   Tarzanin Frank   Hodder David   in Journal of the American Helicopter Society

ISSN:2161-6027|28|2|47-54

AHS International‎(1983)‎

Access to resources Favorite 9.857048