@misc{_Einheitsblatt,
 howpublished={online},
 publisher={Reichsamt für Landesaufnahme, Berlin},
 language={ger},
 type={cartography},
 title={Einheitsblatt 25. [Mapa powiatu słupskiego]},
 keywords={Historical maps, Slupsk (Pomeranian Province) - in cartography, Cartography - Germany - 1918-1933, City plans - 1918-1939},
}