@misc{Laenge_C._F._Versuch,
 author={Laenge, C. F.},
 address={Waldenburg},
 howpublished={online},
 language={ger},
 type={image},
 title={Versuch einer Petrographischen und Flötz Charte von den Waldenburger u.Neuröder Steinkohlen Revieren [...]},
 keywords={Enrich Europeana Plus, petrography, manuscript map, cartography, bituminous coal - geology, Lower Silesian Coal Basin, geology},
}