Barner, H. Classification and selection of seed sources / H. Barner, Kirsten Olesen. - Copenhagen : Danida Forest Seed Centre, 1988. - 33 p. : ill. ; 30 cm. - Lecture note ; B-1 . Subjects--Topical Terms: Seed industry and trade.Germplasm resources, Plants. Dewey Class. No.: 631.5