Tours are conducted by The Devil's Sinkhole Society, a local volunteer group that works in conjunction of Texas Parks and Wildlife Department and Bat Conservation International to facilitate visitor education and tours.
Upon leaving the Army for a second time in 1932, Bone continued to work in the fields of landscape design and civil engineering for the National Park Service (NPS), the Army Corps of Engineers, and the Texas State Parks Board (now the Texas Parks and Wildlife Department).
Texas | Austin, Texas | United States Department of Defense | Fort Worth, Texas | United States Department of State | United States Department of Justice | United States Department of Agriculture | University of Texas at Austin | Texas A&M University | El Paso, Texas | United States Department of Energy | Texas Rangers | Texas Instruments | Lubbock, Texas | United States Department of War | Beaumont, Texas | Texas Rangers (baseball) | Amarillo, Texas | Waco, Texas | Texas Tech University | Corpus Christi, Texas | United States Department of Veterans Affairs | United States Department of the Treasury | War Department | Brownsville, Texas | Tyler, Texas | Walker, Texas Ranger | Los Angeles Police Department | Arlington, Texas | United States Department of Transportation |
When the Devils River Minnows were first classified as threatened in 1999, a group of organizations including the Texas Parks and Wildlife Department, the City of Del Rio, Texas, and the U.S. Fish and Wildlife Service are involved in a Conservation Agreement to assist the minnows’ recovery to the point that it is no longer a threatened species.