@book { KarteninterpretationKartenblattFreiburgiBrNordNr7912150000,
    title = "Karteninterpretation - Kartenblatt Freiburg i. Br. – Nord, Nr. 7912  (1:50.000)",
    author = "Dorothee {Aßmann}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638057592",
    url = "https://www.hausarbeiten.de/document/92141"
}