TY  - BOOK
ED  - United States. Bureau of Mines.
TI  - Mineral facts and problems
PY  - 1956///
CY  - Washington, D. C.
PB  - United States Government Printing Office
KW  - Mines and mineral resources
KW  - United States
KW  - Mineral industries
N1  - Includes bibliographies; p. 1003
ER  -