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MLA

United States. Forest Service, and Forest Inventory and Analysis Program (U.S.). "Forests of Oklahoma, 2017." , online. Print

APA

United States. Forest Service, U. States. Forest Service, & Forest Inventory and Analysis Program (U.S.), F. Inventory and Analysis Program (U.S.). (0000). Forests of Oklahoma, 2017.

Chicago

United States. Forest Service, and Forest Inventory and Analysis Program (U.S.). "Forests of Oklahoma, 2017" (2020): online.