TY  - RPRT
TI  - Geology and zinc-lead deposits in the Couler Valley area, Dubuque County, Iowa
AU  - C. Erwin Brown
AU  - L.G. Collins
AU  - Percy Crosby
PY  - 1955
DO  - 10.3133/mf42
UR  - https://pubs.usgs.gov/publication/mf42
ID  - mf42
ER  -