Keiding, H. Gene conservation and tree improvement / H. Keiding. - Copenhagen : Danida Forest Seed Centre, 1991. - 19 p. : ill. ; 30 cm. - Lecture note ; no. D-9 . Includes bibliographical references (p. 15-16) Subjects--Topical Terms: Forests and forestry. Dewey Class. No.: 634.9 KEI