Assmann, Ernst. The principles of forest yield study : studies in the organic production, structure, increment, and yield of forest stands / Translated by Sabine H. Gardiner. English editor: P. W. Davis. - Oxford : Pergamon Press 1970. - xiv, 506 p. : ill. Translation of Waldertragskunde. ISBN: 0080066585 Subjects--Topical Terms: Forests and forestry.