Roth, Lawrence O. An introduction to agricultural engineering : a problem-solving a pproach / Lawrence O. Roth and Harry L. Field. - 2nd ed. - New York : Van Nostrand Reinhold, c1991. - v, 346 p. : ill. ; 24 cm. "An Avi book." Includes index. ISBN: 0442006519 Subjects--Topical Terms: agricultural engineering. Dewey Class. No.: 630 / ROT