APA (7th ed.) Citation

Warner, L. A., & Robinson, C. S. (1981). Geology of the eastern part of the Harold D. Roberts Tunnel, Colorado (Stations 690+00 to 1238+58). United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Warner, Lawrence Allen, and Charles Sherwood Robinson. Geology of the Eastern Part of the Harold D. Roberts Tunnel, Colorado (Stations 690+00 to 1238+58). Washington: United States Department of the Interior, Geological Survey, 1981.

MLA (9th ed.) Citation

Warner, Lawrence Allen, and Charles Sherwood Robinson. Geology of the Eastern Part of the Harold D. Roberts Tunnel, Colorado (Stations 690+00 to 1238+58). United States Department of the Interior, Geological Survey, 1981.