Safford, L. O., Little, E. L. (Elbert Luther)., Frank, R. M. (1969). Trees and shrubs of the Penobscot Experimental Forest, Penobscot County, Maine. Upper Darby, Pa.: Northeastern Forest Experiment Station.MLA Citation
Safford, Lawrence O, Elbert L. (Elbert Luther) Little, and Robert M Frank. Trees And Shrubs of the Penobscot Experimental Forest, Penobscot County, Maine. Upper Darby, Pa.: Northeastern Forest Experiment Station, 1969.
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