TY  - RPRT
TI  - The selenium content of U.S.G.S. standard rocks
AU  - M. M. Schnepfe
AU  - F.J. Flanagan
PY  - 1973
DO  - 10.1016/0009-2541(73)90030-2
UR  - https://pubs.usgs.gov/publication/70009774
ID  - 70009774
ER  -