By Flettner Anton   in Journal of the American Helicopter Society

ISSN:2161-6027|1|2|18-19

AHS International‎(1956)‎

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By Flettner Anton   in Journal of the American Society of Naval Engineers

ISSN:0099-7056|37|1|149-153

American Society of Naval Engineers‎(1925)‎

Access to resources Favorite 21.749279