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