TY  - BOOK
AU  - Young,John E.
TI  - Mining the earth
T2  - Worldwatch paper
U1  - 301 
PY  - 1992///
CY  - Washington, D.C.
PB  - Worldwatch Institute
KW  - Mineração
N1  - "July 1992."; Includes bibliographical references (p. 46-53)
ER  -