TY  - RPRT
TI  - Geochemical association of niobium (columbium) and titanium and its geological and economic significance
AU  - Michael Fleischer
AU  - K. J. Murata
AU  - Janet D. Fletcher
AU  - Perry F. Narten
PY  - 1952
DO  - 10.3133/cir225
UR  - https://pubs.usgs.gov/publication/cir225
ID  - cir225
ER  -