Guither, Harold D. Heritage of plenty; a guide to the economic history and development of U.S. agriculture - 2 ed. - Danville, Ill., : Interstate, 1972 - 295 p. : ilus ; mapas ; gráfs LCCN: 16063 Subjects--Topical Terms: Agricultura--E.U.A.Agricultura--Historia--E.U.A. Dewey Class. No.: 630.9 / G85 1972