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close this section of the libraryMan Influence on nature.(2)
View the documentThe Pinchot Institute system for environmental forestry studies. Upper Darby, Pa. : Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station, 1973.
View the documentAgricultural research : impact on environment / by Thomas R. Hargrove. Hargrove, Thomas R. Ames, Iowa : Agriculture and Home Economics Experiment Station, Iowa State University of Science and Technology, 1972.