Die Ost-See, Mittlerer Theil, 191520th century, 2 decade, BalticSeaChart, Map of Lithuania/Poland description Die Ost-See, Mittlerer Theil Berlin, 80 x 110 cm, with 13 inset maps. Year 1915 Author Reichs-Marine-Amt. Sources American Geographical Society collection at University of Wisconsin, Milwaukee, Libraries: https://collections.lib.uwm.edu