TY  - BOOK
AU  - Rastall, R H.
AU  - Wilcockson, W H.
ED  - London, Imperial Institute.
TI  - Tungsten ores
U1  - 553.464 
PY  - 1920///
CY  - London
PB  - John Murray
KW  - Wolframite
KW  - Economic geology
KW  - Ore deposits
N1  - Includes bibliographical references
ER  -