Literature
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Roger Sayre, Patrick Comer, Harumi Warner, and Jill Cress, 2009, A New Map of Standardized Terrestrial Ecosystems of the Conterminous United States, Professional Paper 1768, U.S. Department of the Interior, U.S. Geological Survey
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Limstrom, Gustaf A. 1963. Proposed seed collection zones for the central states. In: Westing, Arthur H., ed. Proceedings of the Third Central States Forest Tree Improvement Conference. Lafayette, IN: Purdue University: 31-39.
Yeatman, C.W, 1976, Seed Origin - First, Last, and Always. Information Report PS-X-64., Petawawa Forest Experiment Station Chalk River, Ontario.
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