Szukana fraza: [Abstract = "Maps of the Prussian engineer, Christian Friedrich von Wrede were inaccessible to scholars of history and geography of Silesia for nearly 150 years. Maps material, designed for military purposes, was heavily guarded firstly by the Prussian King Frederick II and later by his successors for decades. After declassification of the map in 1901, it became possible to analyze this area for the next explorers of the history of the Silesian province."]

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