TY  - BOOK
AU  - BUREAU OF MINES
TI  - MINERAL FACTS AND PROBLEMS
T2  - 0
U1  - 622.11 
PY  - 1975///
CY  - ESTADOS UNIDOS
PB  - UNITED STATES DEPARTAMENT
KW  - CIENCIAS APLICADAS
N1  - PROBLEMS-MINERAL
ER  -