Donahue, Roy L. Exploring agriculture : an introduction to food and agriculture / by Roy L. Donahue and James E. Christiansen. - 6th ed. - Enlgewood Cliffs, N.J : Prentice-Hall , 1984. - 451 p. : ill. ; 25 cm. - Prentice_Hall agricultural series . Subjects--Topical Terms: Agriculture Dewey Class. No.: 630 DON