By Hutto A. J.   in Journal of the American Helicopter Society

ISSN:2161-6027|21|1|32-40

AHS International‎(1976)‎

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By Zahner Robert   Myers Richard K.   Hutto Curtis J.   in Southern Journal of Applied Forestry

ISSN:0148-4419|9|1|15-20

Society of American Foresters‎(1985)‎

Access to resources Favorite 1.668716