1. Preliminary geologic map of the Big Costilla Peak area, Taos County, New Mexico, and Costilla County, Colorado Author/Creator: Fridrich, C. J. (Christopher J.) Publication/Creation: Reston, VA : U.S. Dept of the Interior, U.S. Geological Survey, 2012 Resource Type: Map Access & Availability: Loading
2. Preliminary geologic map of the Sanchez Reservoir quadrangle and eastern part of the Garcia quadrangle, Costilla County, Colorado Author/Creator: Thompson, Ren A. Publication/Creation: Denver, Colo. : U.S. Geological Survey, 2007 Resource Type: Map Edition: Version 1.0, posted June, 2007. Access & Availability: Loading