TY  - RPRT
TI  - Production data for the upper Mississippi Valley lead-zinc district
AU  - A.V. Heyl
AU  - A.F. Agnew
AU  - E.J. Lyons
AU  - C. H. Behre
PY  - 1959
DO  - 10.3133/ofr5953
UR  - https://pubs.usgs.gov/publication/ofr5953
ID  - ofr5953
ER  -