TY  - RPRT
TI  - Mercury in the environment; surficial materials of the conterminous United States
AU  - Hansford T. Shacklette
AU  - Josephine G. Boerngen
AU  - Robert L. Turner
PY  - 1971
DO  - 10.3133/cir644
UR  - https://pubs.usgs.gov/publication/cir644
ID  - cir644
ER  -