"Forests and forestry." . . . . . . . . . . . . . . . . . . . . . "A treatise on forestry" . "A treatise on forestry"@da . . "A treatise on forestry"@en . "A Treatise on Forestry. [Edited with introduction and notes by A. Howard Grøn. Translated by M. Tovborg Jensen. With a portrait.]"@en . . "A Treatise on Forestry. [Edited with introduction and notes by A. Howard Grøn. Translated by M. Tovborg Jensen. With a portrait.]" . . . . . . "Society of Forest History" . .