TY  - BOOK
AU  - Beaumont, Peter.
TI  - Drylands: : environmental management and development
T2  - Routledge natural environmental : problems and management series
U1  - 631.0915 
PY  - 1989///
CY  - London
PB  - Routledge
KW  - Agricultura
KW  - Regiones áridas
ER  -