TY  - BOOK
AU  - Canby, Thomas.
TI  - Our changing Earth
SN  - 9780870449109
AV  - 550 
CY  - Washington, D.C. : 
KW  - Conservation of natural resources
KW  - Environmental degradation --
KW  - Environmentalism
KW  - Nature --
KW  - Citizen participation
KW  - Effect of human beings on
N1  -  Includes index
ER  -