Image after Hrabanus Maurus (780-856) de rerum naturalis taken from: http://www.people.freenet.de/kohlwald/glasmacher.html

Hrabanus Maurus De universo, 1023, Kloster Montecassino (Cod.132) auch in dem Buch: Axel von Saldern: Antikes Glas, C.H.Beck, 2004, ISBN 3406519946

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