(1972). Map showing relative erodibility of geologic materials in the Parker quadrangle, Arapahoe and Douglas counties, Colorado. U.S. Geological Survey.
Chicago-Zitierstil (17. Ausg.)Map Showing Relative Erodibility of Geologic Materials in the Parker Quadrangle, Arapahoe and Douglas Counties, Colorado. Washington, D.C: U.S. Geological Survey, 1972.
MLA-Zitierstil (9. Ausg.)Map Showing Relative Erodibility of Geologic Materials in the Parker Quadrangle, Arapahoe and Douglas Counties, Colorado. U.S. Geological Survey, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.