TY  - RPRT
TI  - Geologic map of the Ishpeming Quadrangle, Marquette County, Michigan
AU  - G. C. Simmons
PY  - 1971
DO  - 10.3133/ofr71259
UR  - https://pubs.usgs.gov/publication/ofr71259
ID  - ofr71259
ER  -