Evans, Everett F. Exploring agriculture / Everett F. Evans, Roy L. Donahue. - Englewood Cliffs, N.J. : Prentice-Hall, 1957. - xii, 366 p. : ill., maps. ; 23 cm. Includes bibliographies. Subjects--Topical Terms: Agriculture. LC Class. No.: S495 / .E9 Dewey Class. No.: 630 / EVA 1957