TY  - BOOK
AU  - Yasowsky,Phillip N.
AU  - Graham,Annette P.
ED  - United States.
TI  - Mineral deplation allowances and U.S. import dependence
T2  - Bureau of mines information circular
U1  - 338.20973 
PY  - 1980///
CY  - Washington, D.C.
PB  - United States Government Printing Office
KW  - Mineral industries
KW  - Mining
KW  - production economics
ER  -