TY  - RPRT
TI  - Industrial minerals, today and tomorrow; the raw materials to build the upper Midwest
AU  - P. K. Sims
AU  - Sarah Chadima
AU  - R.F. Biek
PY  - 1992
DO  - 10.3133/ofr92514
UR  - https://pubs.usgs.gov/publication/ofr92514
ID  - ofr92514
ER  -