Williams, Donald B. 1920- Agricultural extension; farm extension services in Australia, Britain and the United States of America [by] Donald B. Williams. - [Carlton, Vic.]: Melbourne University Press, [1968] - xi, 218 p. ISBN: 0522838413 LCCN: 55051566 Nat. Bib. No.: Aus68-578 Subjects--Topical Terms: Agricultural extension work. LC Class. No.: S544 / .W49