TY  - BOOK
AU  - Young,John E.
AU  - Ayres,Ed
TI  - Mining the earth / 
SN  - 1878071114
PY  - 1992///
CY  - Washington, D.C. : 
PB  - Worldwatch Institute, 
KW  - Mineral industries
KW  - Environmental aspects
N1  -  "July 1992.";  Includes bibliography : p. 46-53
ER  -