TY  - BOOK
AU  - Walker,B.H.
TI  - Management of semi-arid ecosystems Dev. in Agri. , Managed-Forest Ecology 7
U1  - 333.7 
PY  - 1979///
CY  - N.Y.
PB  - Elsevier Sc.Pub.Co.
KW  - Economics
ER  -