1. Geologic map of the Fraser 7.5-minute quadrangle, Grand County, Colorado Author/Creator: Shroba, R. R. Publication/Creation: Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2010 Resource Type: Map Edition: Version 1.0. Access & Availability: Loading
2. Geologic map of the Silt quadrangle, Garfield County, Colorado Author/Creator: Shroba, R. R. Publication/Creation: [Reston, Va.?] : U.S. Geological Survey, 2001 Resource Type: Map Edition: Version 1.0. Access & Availability: Loading