> Mehrbändiges Werk
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sheets 18-21:
Karst ... International Association of Geomorphologists; 6th International Conference, Zaragoza 2005, Karst papers ed. by Karl-Heinz Pfeffer
Berlin; Stuttgart: Borntraeger, 2006
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13/17:
International atlas of Karst phenomena 13/17 UIS, Union Internationale de Spéléologie. Ed. by Karl-Heinz Pfeffer
Berlin; Stuttgart: Borntraeger, 1998