TY  - BOOK
AU  - Robert w. christopherson 
TI  - Geosystems: An introduction to physical geography 
SN  - 0-02-322443-6
AV  - GB 54.5 .C48 1992 7504
PY  - 1992///
CY  - USA
PB  - Macmillan company
KW  - physical geography
N1  - includes bibliographical  references and index
ER  -