Winkelman, Don. The traditional farmer : maximization and mechanization. - Paris : Development Centre of the Organisation for Economic Co-op eration and Development, 1972. - v, 94 p. : ill. ; 24 cm. - Employment series ; no. 7 . Includes bibliographical references ( p. 93-94) Subjects--Topical Terms: Agriculture -- Labor productivity. Agriculture -- Economic aspects -- Mathematical models. Farm mechanization. Family farms -- Mexico. Dewey Class. No.: 630.972