TY  - RPRT
TI  - The National Geochemical Survey: Database and documentation
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 2004
DO  - 10.3133/ofr20041001
UR  - https://pubs.usgs.gov/publication/ofr20041001
ID  - ofr20041001
ER  -