Geological Survey, Johnson, R. C., & Smith, M. C. (1993). Geologic map of the Philadelphia Creek quadrangle, Rio Blanco County, Colorado. The Survey ; For sale by Map Distribution.
Chicago Style (17th ed.) CitationGeological Survey, Ronald C. Johnson, and Marjorie C. Smith. Geologic Map of the Philadelphia Creek Quadrangle, Rio Blanco County, Colorado. Reston, VA : Denver, CO: The Survey ; For sale by Map Distribution, 1993.
MLA (8th ed.) CitationGeological Survey, et al. Geologic Map of the Philadelphia Creek Quadrangle, Rio Blanco County, Colorado. The Survey ; For sale by Map Distribution, 1993.
Warning: These citations may not always be 100% accurate.