@article{31161,
      author       = "Koldewitz, Ervin and Backhaus, Arno",
      title        = "Strassen- und Eisenbahnvermessung. Lehrbrief 3  ",
      year         = "1957",
      note         = "ÚSGK 10.7.1958. - 2524/70, 1 sv. - 2 sv.",
}