TY  - RPRT
TI  - Elemental composition of surficial materials in the conterminous United States
AU  - H.T. Shacklette
AU  - J. C. Hamilton
AU  - J.G. Boerngen
AU  - J.M. Bowles
PY  - 1971
DO  - 10.3133/pp574d
UR  - https://pubs.usgs.gov/publication/pp574D
ID  - pp574D
ER  -