TY  - RPRT
TI  - Chemical analyses of soils and other surficial materials of the conterminous United States
AU  - Josephine G. Boerngen
AU  - Hansford T. Shacklette
PY  - 1981
DO  - 10.3133/ofr81197
UR  - https://pubs.usgs.gov/publication/ofr81197
ID  - ofr81197
ER  -