TY  - BOOK
AU  - BUREAU OF MINES
TI  - MINERAL FACTS AND PROBLEMS
T2  - 0
U1  - 549 
PY  - 1985///
CY  - U.S.A.
PB  - UNITED STATES DEPARTAMENT
KW  - CIENCIAS PURAS
N1  - MINERAL INDUSTRIES-NONMETALLIC
ER  -