SP-52 Messages in Stone: Colorado's Colorful Geology (2nd Edition) SP-52 Messages in Stone: Colorado’s Colorful Geology (2nd Edition)
OF-02-06 Geologic Map of the Fort Garland SW Quadrangle OF-02-06 Geologic Map of the Fort Garland SW Quadrangle, Costilla County, Colorado
OF-99-14 Geologic Hazards and Mineral Resource Potential of Southwestern Costilla County OF-99-14 Geologic Hazards and Mineral Resource Potential of Southwestern Costilla County, Colorado
B-02 Geology of the Grayback Mining District B-02 Geology of the Grayback Mining District, Costilla County, Colorado