By Gates Charles A.   Piziali Raymond A.   DuWaldt Frank A.   in Journal of the American Helicopter Society

ISSN:2161-6027|8|2|14-27

AHS International‎(1963)‎

Access to resources Favorite 8.792747

By Gates Charles E   in LOGOS: The Journal of the World Book Community

ISSN:1878-4712|7|1|12-17

Brill‎(1996)‎

Access to resources Favorite 2.7743242

By Daughaday Hamilton   DuWaldt Frank   Gates Charles   in Journal of the American Helicopter Society

ISSN:2161-6027|2|3|27-45

AHS International‎(1957)‎

Access to resources Favorite 2.080743