TY - BOOK AU - Leon, Jorge, ed. AU - Withers, Lyndsey A., ed. ED - Food and Agricultural Organization of the United Nations. TI - Guide lines seed exchange plant introduction tropical crops T2 - FAO plant production and protection paper SN - 9251024774 U1 - 631.5230913 21st ed. PY - 1986/// CY - Rome PB - Food and Agriculture Organisation of the United Nations KW - Plant introduction KW - Seed exchanges propagation ER -