@article{KrumreinKuglerRaumetal.1995,
  author    = {Krumrein, Frieder and Kugler, Brigitte and Raum, Bernd and Schr{\"o}der, Ulrich and Uhlenwinkel, Anke},
  title     = {Terra Erdkunde : Arbeitsheft f{\"u}r Nordrhein-Westfalen 5 / 6},
  publisher = {Perthes},
  address   = {Gotha},
  pages     = {34 S.},
  year      = {1995},
  language  = {de}
}
@article{EhrlichmannKrumreinMeinckeetal.1995,
  author    = {Ehrlichmann, Frank and Krumrein, Frieder and Meincke, Rolf and Raum, Bernd and Schr{\"o}der, Ulrich and Uhlenwinkel, Anke},
  title     = {Terra Erdkunde : Arbeitsheft f{\"u}r Brandenburg ; Lehrerheft},
  publisher = {Perthes},
  address   = {Gotha},
  pages     = {36 S.},
  year      = {1995},
  language  = {de}
}
@article{EhrlichmannKrumreinKugleretal.1995,
  author    = {Ehrlichmann, Frank and Krumrein, Frieder and Kugler, Brigitte and Meincke, Rolf and Raum, Bernd and Schr{\"o}der, Ulrich and Uhlenwinkel, Anke and Zimmermann, Bernd},
  title     = {Terra Erdkunde : Arbeitsheft f{\"u}r Berlin 5 / 6},
  publisher = {Perthes},
  address   = {Gotha},
  pages     = {34 S.},
  year      = {1995},
  language  = {de}
}
@article{KrumreinKuglerRaumetal.1996,
  author    = {Krumrein, Frieder and Kugler, Brigitte and Raum, Bernd and Schr{\"o}der, Ulrich and Uhlenwinkel, Anke},
  title     = {Terra Erdkunde : Arbeitsheft f{\"u}r Nordrhein-Westfalen 5 / 6 ; Lehrerheft},
  publisher = {Perthes},
  address   = {Gotha},
  pages     = {32 S.},
  year      = {1996},
  language  = {de}
}
@article{EhrlichmannKrumreinKugleretal.1996,
  author    = {Ehrlichmann, Frank and Krumrein, Frieder and Kugler, Brigitte and Meincke, Rolf and Raum, Bernd and Schr{\"o}der, Ulrich and Uhlenwinkel, Anke and Zimmermann, Bernd and Zoska, Marianne},
  title     = {Terra Erdkunde : Arbeitsheft f{\"u}r Berlin 5 / 6 ; Lehrerheft},
  publisher = {Perthes},
  address   = {Gotha},
  pages     = {32 S.},
  year      = {1996},
  language  = {de}
}