A special thanks to Randy Swaty and The Nature Conservancy for this data, and for the oppurtunity to assist them with this endevour.

McNab, W.H.; Cleland, D.T.; Freeouf, J.A.; Keys, Jr., J.E.; Nowacki, G.J.; Carpenter, C.A., comps. 2007. Description of ecological subregions: sections of the conterminous United States [CD-ROM]. Gen. Tech. Report WO-76B. Washington, DC: U.S. Department of Agriculture, Forest Service. 80 p.

Comprehensive Report Ecological System - Allegheny-Cumberland Dry Oak Forest and Woodland. (n.d.). Retrieved November 30, 2016, from http://explorer.natureserve.org/servlet/NatureServe?searchSystemUid=ELEMENT_GLOBAL.2.723154