APA (7th ed.) Citation

(1972). Map showing relative excavatability of geologic materials in the Parker quadrangle, Arapahoe and Douglas counties, Colorado. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Map Showing Relative Excavatability of Geologic Materials in the Parker Quadrangle, Arapahoe and Douglas Counties, Colorado. Washington, D.C: U.S. Geological Survey, 1972.

MLA (9th ed.) Citation

Map Showing Relative Excavatability of Geologic Materials in the Parker Quadrangle, Arapahoe and Douglas Counties, Colorado. U.S. Geological Survey, 1972.