Late Bronze Age and Early Iron Age amber finds from the catchment areas of the rivers Oder and Vistula - Bukowski, Zbigniew (Investigations into amber. Badania bursztynu. Proceedings of the International Interdisciplinary Symposium: Baltic amber and other fossil resins. 997 Urbs Gyddanycz-1997 Gdańsk. Gdańsk, 2-6 september 1997., 1999)