“Introduction.” Trees and Shrubs of Kentucky, by Mary E. Wharton and Roger W. Barbour, University Press of Kentucky, Lexington, Kentucky, 1973, pp. 1–7, www.jstor.org/stable/j.ctt130jb1x.4. Accessed 13 Aug. 2020.
Wharton, M., & Barbour, R. (1973). Introduction. In Trees and Shrubs of Kentucky (pp. 1-7). Lexington, Kentucky: University Press of Kentucky. Retrieved August 13, 2020, from www.jstor.org/stable/j.ctt130jb1x.4
Wharton, Mary E., and Roger W. Barbour. "Introduction." In Trees and Shrubs of Kentucky, 1-7. Lexington, Kentucky: University Press of Kentucky, 1973. Accessed August 13, 2020. www.jstor.org/stable/j.ctt130jb1x.4.
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