TY  - BOOK
AU  - Christopherson,Robert W.
TI  - Geosystems: an introduction to physical geography 
SN  - e135053145
AV  - GB54.5 Ch75 1997
PY  - 1997///
CY  - Upper Saddle River, N.J.
PB  - Prentice-Hall
KW  - Geografía física
ER  -