TY  - RPRT
TI  - Bedrock geologic map of the Ishpeming quadrangle, Marquette County, Michigan
AU  - George Clarke Simmons
PY  - 1974
DO  - 10.3133/gq1130
UR  - https://pubs.usgs.gov/publication/gq1130
ID  - gq1130
ER  -