TY  - BOOK
AU  - Leon, J.
AU  - Withers, L.A.
TI  - Guidelines for seed exchange and plant introduction in tropical crops 
T2  - FAO Plant Production and Protection Paper
SN  - 92-5-102477-4
PY  - 1986///
CY  - Food and Agriculture Organization of the United Nations 
PB  - Rome
KW  - Agriculture
ER  -