TY  - RPRT
TI  - Analytical methods in geochemical investigations of the Pierre Shale
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1972
DO  - 10.3133/pp391
UR  - https://pubs.usgs.gov/publication/pp391
ID  - pp391
ER  -