TY  - BOOK
AU  - Beus Alexei A Ed.
TI  - Geology of tungsten: International geological correlation programme project 26MAWAM
T2  - Earth science; 18
U1  - H167, M7 
PY  - 1986///
CY  - Paris
PB  - UNESCO         
KW  -  Tungsten
KW  - Geology
ER  -