TY  - RPRT
TI  - Extraction spectrophotometric determination of niobium in rocks with sulfochlorophenol S
AU  - A. E. Childress
AU  - L. P. Greenland
PY  - 1980
DO  - 10.1016/s0003-2670(01)84330-0
UR  - https://pubs.usgs.gov/publication/70010395
ID  - 70010395
ER  -