TY  - BK
AU  - van Straaten,P.
TI  - Rocks for crops:  Agrominerals of Sub-Saharan Africa
SN  - 0-88955-512-5
U1  - 631.42206 
PY  - 2002///
CY  - Nairobi (Kenya)
PB  - ICRAF, 
ER  -