Bull's head and mermaid : the history of paper and watermarks from the Middle Ages to the modern period / booklet and catalogue of the exhibition presented by the Landesarchiv Baden-Württemberg, Hauptstaatsarchiv Stuttgart and the Austrian Academy of Sciences, Kommission für Schrift- und Buchwesen des Mittelalters, Vienna ; [Jan C. A. van der Lubbe, Héctor Moreu Otal, Marieke van Delft a. o.] ; edited by Peter Rückert, Sandra Hodeček, Emanuel Wenger. - 3rd, once more enlarged edition. - Stuttgart [a. o.] : Landesarchiv Baden-Württemberg, 2009. - 127, [1] p.: ill., facims., map