O'Sullivan, R. B. (1985). Preliminary geologic map of the Rio Blanco quadrangle, Rio Blanco and Garfield Counties, Colorado. The Survey.
Chicago Style (17th ed.) CitationO'Sullivan, Robert Brett. Preliminary Geologic Map of the Rio Blanco Quadrangle, Rio Blanco and Garfield Counties, Colorado. Reston, Va.: The Survey, 1985.
MLA (9th ed.) CitationO'Sullivan, Robert Brett. Preliminary Geologic Map of the Rio Blanco Quadrangle, Rio Blanco and Garfield Counties, Colorado. The Survey, 1985.
Warning: These citations may not always be 100% accurate.