Cite
MLA
Geological Survey (U.S.) (cartographer). Roby sheet, Texas U.S. Geological Survey. - University of Texas Libraries Collections. 1915-01-01. https://collections.lib.utexas.edu/catalog/utlmaps:ae121d8e-d1dc-4f39-b142-7348c95b2b43APA
Geological Survey (U.S.) (cartographer). (1915-01-01). Roby sheet, Texas U.S. Geological Survey.. Retrieved June 01, 2026, from https://collections.lib.utexas.edu/catalog/utlmaps:ae121d8e-d1dc-4f39-b142-7348c95b2b43Chicago
Geological Survey (U.S.) (cartographer). Roby sheet, Texas U.S. Geological Survey.. 1915-01-01. "Roby sheet, Texas U.S. Geological Survey. – Collections". University of Texas Libraries Collections. <https://collections.lib.utexas.edu/catalog/utlmaps:ae121d8e-d1dc-4f39-b142-7348c95b2b43> (01-June-2026).Note that these citations have been automatically generated, please verify that citation is correct and contains all necessary information.