1. Department of Historical Studies, University of Gothenburg, Gothenburg, Sweden
2. Bohusläns Museum, Uddevalla, Sweden
3. German Mining Museum, Bochum, Germany
4. The Faculty for Geosciences, Ruhr University Bochum, Bochum, Germany
5. The Saxo Institute, University of Copenhagen, Copenhagen, Denmark
6. Ceramic Studies, Nyhamnsläge, Sweden
7. The Archaeological Research Laboratory, Department of Archaeology and Classical Studies, Stockholm University, Stockholm, Sweden
8. SEIR-materialeanalyse A/S, Helsingør, Denmark