TY  - RPRT
TI  - Detailed geologic map of the recently active copper mines; Houghton and Keweenaw Counties, Michigan
AU  - H. R. Cornwall
AU  - J.J. Runner
AU  - A. A. Stromquist
AU  - R. W. Swanson
AU  - W. S. White
PY  - 1949
DO  - 10.3133/ofr504
UR  - https://pubs.usgs.gov/publication/ofr504
ID  - ofr504
ER  -