@book{FischerPoetsch1994,
  author    = {Fischer, Wolfgang and P{\"o}tsch, Joachim},
  title     = {Berlin und Brandenburg},
  series = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  volume    = {2},
  journal   = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  publisher = {Urania-Verl.},
  address   = {Leipzig [u.a.]},
  pages     = {199 S.},
  year      = {1994},
  language  = {de}
}
@book{WesthusZuendorf1995,
  author    = {Westhus, Werner and Z{\"u}ndorf, Hans-Joachim},
  title     = {Th{\"u}ringen},
  series = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  volume    = {4},
  journal   = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  publisher = {Urania-Verl.},
  address   = {Leipzig [u.a.]},
  pages     = {205 S.},
  year      = {1995},
  language  = {de}
}
@book{OPUS4-28979,
  title     = {OTIS : Zeitschrift der Arbeitsgemeinschaft Berlin-Brandenburgischer Ornithologen},
  editor    = {Wallschl{\"a}ger, Hans-Dieter},
  year      = {1993},
  language  = {de}
}
@book{OPUS4-28978,
  title     = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  editor    = {P{\"o}tsch, Joachim and Weinert, Erich},
  publisher = {Urania-Verl.},
  address   = {Leipzig [u.a.]},
  year      = {1993},
  language  = {de}
}
@book{Rutschke1997,
  author    = {Rutschke, Erich},
  title     = {Adler im Aufwind : See-, Fisch- und Schreiadler zwischen Spree und Ostsee ; verfemt - verfolgt - gesch{\"u}tzt},
  publisher = {Stapp},
  address   = {Berlin},
  pages     = {136 S.},
  year      = {1997},
  language  = {de}
}
@book{Rutschke1997,
  author    = {Rutschke, Erich},
  title     = {Wildg{\"a}nse : Lebensweise - Schutz - Nutzung},
  publisher = {Parey},
  address   = {Berlin},
  pages     = {260 S.},
  year      = {1997},
  language  = {de}
}
@book{BoenselSchmidtWedra1996,
  author    = {B{\"o}nsel, Dirk and Schmidt, Petra and Wedra, Christel},
  title     = {Hessen},
  series = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  volume    = {5},
  journal   = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  publisher = {Urania-Verl.},
  address   = {Leipzig [u.a.]},
  pages     = {208 S.},
  year      = {1996},
  language  = {de}
}
@book{OPUS4-25991,
  title     = {Enthorner auf Herz und Nieren gepr{\"u}ft},
  editor    = {Brehme, Angelika and Huschke, Wolfgang},
  year      = {1996},
  language  = {de}
}
@book{OPUS4-25996,
  title     = {Arbeitstreffen zur {\"O}kologie des Kolkraben <1995, Potsdam> : Protokoll der Vortr{\"a}ge und Diskussionen},
  editor    = {Hau, Bernhard and Wallschl{\"a}ger, Hans-Dieter},
  address   = {Potsdam},
  year      = {1996},
  language  = {de}
}
@book{NezadalWelssPoetsch1996,
  author    = {Nezadal, Werner and Welß, Walter and P{\"o}tsch, Joachim},
  title     = {Franken},
  series = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  volume    = {6},
  journal   = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  publisher = {Urania-Verl.},
  address   = {Leipzig [u.a.]},
  pages     = {199 S.},
  year      = {1996},
  language  = {de}
}
@book{OPUS4-28335,
  title     = {Handbuch der V{\"o}gel der Sowjetunion : Bd. 6, Teil 2 Charadriiformes (Alcae)},
  volume    = {6.2},
  editor    = {Flint, V. E. and Golovkin, A. N.},
  publisher = {Westarp Wiss.},
  address   = {Magdeburg},
  isbn      = {3-89432-415-5},
  pages     = {180 S.},
  year      = {1994},
  language  = {de}
}
@book{Rutschke1998,
  author    = {Rutschke, Erich},
  title     = {Der Kormoran : Biologie, {\"O}kologie, Schadabwehr},
  publisher = {Parey},
  address   = {Berlin},
  pages     = {161 S.},
  year      = {1998},
  language  = {de}
}