The U.S. National plant germplasm system - Washington, D.C. : National Academy Press, 1991 - 171 p. : ilus. - Managing global genetic resources . - Managing global genetic resources . LCCN: 56338 Subjects--Topical Terms: Germoplasma.Plantas--Mejoramiento.Recursos genéticos. Dewey Class. No.: 631.522 / N32