@article{KrumreinKuglerRaumetal.1995,
  author    = {Frieder Krumrein and Brigitte Kugler and Bernd Raum and Ulrich Schr{\"o}der and Anke Uhlenwinkel},
  title     = {Terra Erdkunde : Arbeitsheft f{\"u}r Nordrhein-Westfalen 5 / 6},
  year      = {1995},
}