SP-52 Messages in Stone: Colorado's Colorful Geology (2nd Edition) SP-52 Messages in Stone: Colorado’s Colorful Geology (2nd Edition)
OF-01-04 Geologic Map of the Basin Mountain Quadrangle OF-01-04 Geologic Map of the Basin Mountain Quadrangle, La Plata County, Colorado
OF-03-21 Geologic Map of the Electra Lake 7.5-Minute Quadrangle OF-03-21 Geologic Map of the Electra Lake 7.5-Minute Quadrangle, La Plata County, Colorado
OF-02-01 Geologic Map of the Hermosa Quadrangle OF-02-01 Geologic Map of the Hermosa Quadrangle, La Plata County, Colorado