By Kummer Ralph W.   in Journal of the American Helicopter Society

ISSN:2161-6027|1|1|46-52

AHS International‎(1956)‎

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By Foster Ralph W.   in Journal of Forestry

ISSN:0022-1201|55|10|727-730

Society of American Foresters‎(1957)‎

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By Smith Ralph W.   in Journal of Forestry

ISSN:0022-1201|43|12|900-904

Society of American Foresters‎(1945)‎

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By Larkin Ralph W.   in Journal of Asian and African Studies

ISSN:0021-9096|17|1-2|155-157

Brill‎(1982)‎

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By HOLZENTHAL RALPH W.   in Annals of the Entomological Society of America

ISSN:1938-2901|79|1|251-255

Entomological Society of America‎(1986)‎

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By Howard Ralph W.   in Annals of the Entomological Society of America

ISSN:1938-2901|94|1|152-158

Entomological Society of America‎(2001)‎

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By HOWARD RALPH W.   in Annals of the Entomological Society of America

ISSN:1938-2901|91|1|101-112

Entomological Society of America‎(1998)‎

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By HOWARD RALPH W.   in Annals of the Entomological Society of America

ISSN:1938-2901|73|1|36-38

Entomological Society of America‎(1980)‎

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By Holzenthal Ralph W.   in American Entomologist

ISSN:2155-9902|54|4|218-221

Entomological Society of America‎(2008)‎

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By HOWARD RALPH W.   in Annals of the Entomological Society of America

ISSN:1938-2901|85|3|317-325

Entomological Society of America‎(1992)‎

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