Ordnance Survey (4) Charry, Brinda (2) Porteus, Tim (2) Dyke, Chris (1) Zabinski, Grzegorz (jan Dlugosz University, Wozniak, Marcin (museum Of Ancient Masovian Metallurgy, Gramacki, Jaroslaw (university Of Zielona Gora, Gramacki, Artur (university Of Zielona Gora (1)