Figure 1From: Historic Fire Regime of an Upland Oak Forest in South-Central North AmericaLocation of fire history sample collection within the study site, Okmulgee Game Management Area, the Cross Timbers region of Oklahoma, USA, and North America. Sample collection locations are approximate and were not mapped with a global positioning system. Triangles represent locations of PDSI grid points 179 and 193. Map contour lines are in 3.05 m increments.Back to article page