Seed trade in rural markets : implications for crop diversity and agricultural development / Lipper, Leslie. Anderson, C. Leigh, Dalton, Timothy J. Seed industry and trade Seed industry and trade Seed exchanges Seed exchanges 381 EAR 2010 A015 Or. 338 EAR 2010 A015 Or. London ; Sterling, VA : Earthscan : Food and Agriculture Organization of the United Nations, 2010. 2010. Text xxiii, 232 p. :