TY  - RPRT
TI  - Geologic map of the Swisshelm Mountains, and a description of the development of the Swisshelm and Pedregosa Mountains, Cochise County, Arizona
AU  - Harald Drewes
PY  - 1991
DO  - 10.3133/i2177
UR  - https://pubs.usgs.gov/publication/i2177
ID  - i2177
ER  -