TY  - BOOK
AU  - Canby,Thomas Y.
TI  - Our changing earth
SN  - 0-87044-910-9
U1  - Ref. 363.7 C214 1994 
PY  - 1994///
CY  - Washington, D.C.
PB  - National Geographic Society
KW  - Environmentalism
KW  - Environmental degradation
KW  - Citizen participation
N1  - Includes index
ER  -