 | Trees and shrubs of the Penobscot Experimental Forest | (1) |
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 | Trees and shrubs of the Penobscot Experimental Forest, Penobscot County, Maine / by Lawrence O. Safford, Robert M. Frank Elbert L. Little, Jr. Safford, Lawrence O. cn Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1969. | |
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