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book (2)

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English (2)

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1964 (1)

1961 (1)

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Book

The Virginia pine sawfly in 1960 : a special cooperative report
Authors: McIntyre, T. --- Heller, Robert Chester --- Morris, C. L. --- Northeastern Forest Experiment Station (Radnor, Pa.)
Year: 1961 Publisher: Upper Darby, PA. : Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station,

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Sawflies. --- Scrub pine --- Diseases and pests --- History.

Book

Identification of tree species on large-scale panchromatic and color aerial photographs
Authors: Heller, Robert Chester --- Doverspike, George E. --- Aldrich, Robert Clement --- United States.
Year: 1964 Publisher: Washington, D.C. : U.S. Dept. of Agriculture, Forest Service,

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Aerial photography in forestry. --- Photographic interpretation. --- Trees

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