By Orr L. W.   in Journal of Forestry

ISSN:0022-1201|52|4|250-252

Society of American Foresters‎(1954)‎

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By Orr L. W.   in Journal of Forestry

ISSN:0022-1201|57|9|639-640

Society of American Foresters‎(1959)‎

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By Orr L. W.   Kowal R. J.   in Journal of Forestry

ISSN:0022-1201|54|10|653-656

Society of American Foresters‎(1956)‎

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By Allison J. H.   Orr L. W.   in Journal of Forestry

ISSN:0022-1201|27|7|821-824

Society of American Foresters‎(1929)‎

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By ORR L. W.   MOTT L. O.   in Journal of Economic Entomology

ISSN:1938-291X|38|4|428-432

Entomological Society of America‎(1945)‎

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