Shippen, J.M. Basic farm machinery / J. M. Shippen, C. R. Ellin, C. H. Clover. - 3rd ed. - Oxford : Pergamon Press, 1980. - x, 288 p. : ill. ; 26 cm. - Pergamon international library of science, technology, engineering, and social studies . Includes index. Open access. ISBN: 0080249124 Subjects--Topical Terms: Agricultural machinery.