TY  - BOOK
AU  - SCHMITZ , H / SOMMER , M / WALTER , S .
TI  - ANIMAL TRACTION IN RAINFED AGRICULTURE IN AFRICA AND SOUTH AMERICA: Determinants and Experiences
SN  - 3528020598
AV  - S760 .S2 1991 
PY  - 1991///
CY  - BRAUNSCHWRIG
PB  - VIEWEG
ER  -