Kingdom of Prussia Monarchy Poland Austria 1858 huge Dufour map Dyonnet engravedMonarchie Prussienne. (Prussian Kingdom, Gulf of Danzig, Vistula River, Hannover, Isle of Ruga, Iron Mountains, Northern Bavaria). Issued 1858, Paris, by A. H. Dufour. Engraved by Dyonnet. Monumental and beautifully engraved mid 19th century map with original hand color. A very large, oversized map, which is not to be confused with similar maps of this era which are typically half this size. Original fold line as issued, printed on thick heavy paper.