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