Willan, R.L. Matching seed source to planting site / R.L. Willan & H. Barner. - Copenhagen : Danida Forest Seed Centre, 1989. - 20 p. : ill. ; 30 cm. - Lecture note ; no. B-3 . Includes bibliographical references (p. 14-5) Subjects--Topical Terms: Seeds. Seed technology. Dewey Class. No.: 631.5