Preliminary geologic map of the Culebra Peak Area, Sangre de Cristo Mountains, Las Animas and Costilla Counties, Colorado [electronic resource] / by Christopher J. Fridrich and Robert M. Kirkham ; U.S. Department of the Interior, U.S. Geological Survey.
Imprint
[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2008.