Geological Survey (U.S.) & Ecklund, C. A. (1965). Canyon de Chelly National Monument, Apache County, Ariz ("Unedited advanced sheet subject to correction.".). The Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and C. A. Ecklund. Canyon De Chelly National Monument, Apache County, Ariz. "Unedited advanced sheet subject to correction.". Washington: The Survey, 1965.
MLA (9th ed.) CitationGeological Survey (U.S.) and C. A. Ecklund. Canyon De Chelly National Monument, Apache County, Ariz. "Unedited advanced sheet subject to correction.". The Survey, 1965.
Warning: These citations may not always be 100% accurate.