TY  - BOOK
AU  - Parker,Raymond L.
AU  - Fleischer,Michael
TI  - Geochemistry of niobium and tantalum
T2  - United States. Geological Survey. Professional paper
U1  - 546.524 
PY  - 1968///
CY  - Washington
PB  - United States Government Printing Office
KW  - Niobium
KW  - Tantalum
N1  - Includes bibliographies
ER  -