TY  - RPRT
TI  - Zinc-lead-copper resources and general geology of the Upper Mississippi Valley district
AU  - Allen Van Heyl
AU  - E.J. Lyons
AU  - A.F. Agnew
AU  - C. H. Behre
PY  - 1955
DO  - 10.3133/b1015g
UR  - https://pubs.usgs.gov/publication/b1015G
ID  - b1015G
ER  -