TY  - RPRT
TI  - Element concentrations toxic to plants, animals, and man
AU  - L. P. Gough
AU  - Hansford Threlkeld Shacklette
AU  - Arthur A. Case
PY  - 1979
DO  - 10.3133/b1466
UR  - https://pubs.usgs.gov/publication/b1466
ID  - b1466
ER  -