TY  - RPRT
TI  - Geologic map of the Colorado Springs - Castle Rock area, Front Range urban corridor, Colorado
AU  - D. E. Trimble
AU  - M. N. Machette
PY  - 1979
DO  - 10.3133/i857f
UR  - https://pubs.usgs.gov/publication/i857F
ID  - i857F
ER  -