TY  - BOOK
AU  - Parker,Raymond L.
AU  - Fleischer,Michael
TI  - Geochemistry of niobium and tantalum,
T2  - United States. Geological Survey. Professional paper
AV  - QE75 .P9 no. 612
PY  - 1968///
CY  - Washington
PB  - U.S. Govt. Print. Off.
KW  - Niobium
KW  - Tantalum
N1  - Includes bibliographies
ER  -