OF-75-09 Oil and Gas Fields of Colorado Download Publication Details This first (September 1975) publication by the CGS of oil and gas fields in Colorado is hand annotated on a township and range base map. It shows the name and location of the fields with their recorded production. 1 plate (1:500,000). Digital PDF download. OF-75-09D. Citations Jones, David C. “OF-75-09 Oil and Gas Fields of Colorado.” Oil and Gas Fields. Open File Report. Denver, CO: Colorado Geological Survey, Department of Natural Resources, September 1975. https://coloradogeologicalsurvey.org/publications/oil-gas-fields-map-colorado-1975.