TY  - RPRT
TI  - Background geochemistry of some rocks, soils, plants, and vegetables in the conterminous United States, with sections on field studies
AU  - J. J. Connor
AU  - H.T. Shacklette
AU  - R.J. Ebens
AU  - J. A. Erdman
AU  - A.T. Miesch
AU  - R.R. Tidball
AU  - H. A. Tourtelot
PY  - 1975
DO  - 10.3133/pp574f
UR  - https://pubs.usgs.gov/publication/pp574F
ID  - pp574F
ER  -