TY  - BOOK
AU  - Walker B H Ed.
TI  - Management of semi arid ecosystems
T2  - Developments in agricultural and managedforest ecology.7
U1  - U:(G:5).1911.N7, L9 
PY  - 1979///
CY  - Amsterdam
PB  - Elsevier          
KW  - Geography-Modern
ER  -