Jordan, Robert A., Species Profile: Southern Hognose Snake (Heterodon simus) on Military Installations in the Southeastern United States, Technical Report SERDP-98-4, US Army Corps of Engineers, March 1998 [1]Archived 2007-06-12 at the Wayback Machine
U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArchived 2016-06-30 at the Wayback Machine, accessed April 27, 2011
U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArchived 2016-06-30 at the Wayback Machine, accessed April 27, 2011
Jordan, Robert A., Species Profile: Southern Hognose Snake (Heterodon simus) on Military Installations in the Southeastern United States, Technical Report SERDP-98-4, US Army Corps of Engineers, March 1998 [1]Archived 2007-06-12 at the Wayback Machine