@misc{_Grad,
 howpublished={online},
 language={ger},
 type={cartography},
 title={Grad Abtheilung 55°/54° der Breite, 34°/35° der Länge, Bande II. Blatt 3.},
 keywords={Cartography (map-making) - history, Cartography - 19th century, Slawno (West Pomeranian Province) - geography},
}