Swanson, Burton E. Agricultural extension : a reference manual / Burton E. Swanson. - 2nd ed. - Rome : FAO, 1993 - xi, 262 p. : ill. ; 30 cm. Include index ISBN: 925101504X Subjects--Topical Terms: Agricultural extension work LC Class. No.: S544 / .A58 1984 Dewey Class. No.: 630 / SWA