TY  - RPRT
TI  - Exploratory drilling in the Prairie du Chien Group of the Wisconsin zinc-lead district by the U.S. Geological Survey in 1949-1950
AU  - Allen Van Heyl
AU  - Erwin J. Lyons
AU  - Allen F. Agnew
PY  - 1951
DO  - 10.3133/cir131
UR  - https://pubs.usgs.gov/publication/cir131
ID  - cir131
ER  -