Planned change in farming systems : progress in on-farm research / edited by Robert Tripp. - Chichester ; New York : Exeter, UK : J. Wiley ; Co-publication with Sayce Pub., c1991. - x, 348 p. : ill., maps ; 25 cm. Includes bibliographical references and index. ISBN: 0471934178 LCCN: 92-150624 Subjects--Topical Terms: Agriculture--Research--On-farm.Agricultural systems--Research. LC Class. No.: S540.O53 / P58 1991