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MacDonald, R. D., and A. R. Coggins. "Notes on Azaleas Growing on Gregory Bald." The University of Tennessee Arboretum Society Bulletin 3, no. 1 (1967): 9-13.
MacDonald, R. D., and Eyvind Thor. "American Chestnut in the Southern Appalachians." Journal of Forestry 65, no. 2 (1967): 121-122.