Roy, Ewell Paul. Economics ; applications to agriculture and agribusiness - 2 ed. - Danville, Ill. : Interestate, 1975 - 569 p. ; gráfs. LCCN: 53381 Subjects--Topical Terms: Agricultura--Aspectos económicos.Industrias agrícolas. Dewey Class. No.: 338.1 / R6 1975