TY  - RPRT
TI  - The Geology of the Upper Mississippi Valley Zinc-Lead District
AU  - Allen V. Heyl
AU  - Allen F. Agnew
AU  - Erwin J. Lyons
AU  - Charles H. Behre
AU  - Arthur E. Flint
PY  - 1959
DO  - 10.3133/pp309
UR  - https://pubs.usgs.gov/publication/pp309
ID  - pp309
ER  -