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1
A photo guide to the patterns of discoloration and decay in living northern hardwood trees,
by Shigo, Alex L., 1930-
Upper Darby, Pa., Northeastern Forest Experiment Station, 1969

Government Document Book
2
Our American land.
Washington : [U.S. Dept of Agriculture] : For sale by the Supt. of Docs., G.P.O., 1987

Government Document Book
3
Animal diseases.
Washington : U.S. Dept. of Agriculture, 1956

Book
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