@misc{Opitz_Carl_Map,
 author={Opitz, Carl},
 howpublished={online},
 publisher={Verlag von Franz Cleppien},
 language={ger},
 type={cartography},
 title={Map of the district of Greifswald and the island of Usedom : drawn according to the latest official sources},
 title={Karte des Kreises Greifswald und der Insel Usedom : nach neuesten amtlichen Quellen gezeichnet},
 keywords={The Museum of Middle Pomerania in Slupsk, Museum collections, Historical maps, Slupsk (Pomeranian Province)},
}