@misc{Rex_Rudolph_Graf_von_Die,
 author={Rex, Rudolph Graf von},
 address={[Place not identified]},
 howpublished={online},
 language={ger},
 type={image},
 title={Die Donau. 1873},
 keywords={manuscript map, cartography, contour map, Danube, Enrich Europeana Plus},
}