TY  - BOOK
AU  - Christopherson,Robert W.
TI  - Geosystems: an introduction to physical geography 
SN  - 9780135053140
PY  - 1997///
CY  - Upper Saddle River, N.J.
PB  - Prentice Hall
KW  - Physical geography
N1  - Includes bibliographical references and index
ER  -