TY  - RPRT
TI  - Element concentrations in soils and other surficial materials of the conterminous United States
AU  - Hansford T. Shacklette
AU  - Josephine G. Boerngen
PY  - 1984
DO  - 10.3133/pp1270
UR  - https://pubs.usgs.gov/publication/pp1270
ID  - pp1270
ER  -