United States. Soil Conservation Service & Texas Agricultural Experiment Station. (1985). Soil survey of Big Bend National Park: Part of Brewster County, Texas. The Service.
Chicago Style (17th ed.) CitationUnited States. Soil Conservation Service and Texas Agricultural Experiment Station. Soil Survey of Big Bend National Park: Part of Brewster County, Texas. [Washington, D.C.?]: The Service, 1985.
MLA (9th ed.) CitationUnited States. Soil Conservation Service and Texas Agricultural Experiment Station. Soil Survey of Big Bend National Park: Part of Brewster County, Texas. The Service, 1985.
Warning: These citations may not always be 100% accurate.