Die Fabrikation des Zellstoffes aus Holz. Natronzellstoff. Von Prof. Dr. Erik Hägglund, Direktor des Instituts für Holzchemie der Akademie zu Abo. Band II 2 der “Technik und Praxis der Papierfabrikation”. Vollständiges Lehr- und Handbuch der gesamten Zellstoff-Fabrikation. Herausgegeben von Prof. Dr.-Ing. Emil Heuser. Berlin 1926. Otto Elsner Verlagsgesellschaft m. b. H., Berlin S 42

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