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Penick, J. (2000, February). Pinchot, Gifford (1865-1946), forester, conservationist, and governor of Pennsylvania. American National Biography. Retrieved 14 Apr. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0600524.
Penick, James. "Pinchot, Gifford (1865-1946), forester, conservationist, and governor of Pennsylvania." American National Biography. February, 2000. Oxford University Press. Date of access 14 Apr. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0600524>
Penick, James. "Pinchot, Gifford (1865-1946), forester, conservationist, and governor of Pennsylvania." American National Biography. 1 Feb. 2000; Accessed 14 Apr. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0600524.