Pedersen, Anders P. Tree improvement at species and provenance lavel / Andes P. Pende rsen, Kirsten Olesen and Lars Graudal. - Copenhagen : Danida Forest Seed Centre, 1993. - 12 p. : ill. ; 30 cm. - Lecture note ; no. D-3 . Includes bibliographical references (p.12) Subjects--Topical Terms: Trees-- Propagation. Dewey Class. No.: 634