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Ast, H. und W., G. (2011). Zermatt. |
Ast, H. und W., G. (2011). Holzkohlenerzeugung. |
Howard, A. L. (1920). A Manual of the timbers of the world, their characteristics and uses. |
Boulger, G. S. (1908). Wood, a manual of the natural history and industrial applications of the timbers of commerce. |
Edlin, H. L. (1947). Forestry and woodland life. |