@electronic{www.nordhessen.de,
   title       = {Grimmsteig - Themenwege - Wandern und Nordic Walking - Aktivurlaub - Themen - Urlaub in der Grimmheimat Nordhessen}, 
   url         = {http://www.nordhessen.de/de/grimmsteig},
   biburl      = {https://puma.uni-kassel.de/url/871cb283c8e8f8f2bcbdf8f9bf27c2b0/hotho},
   keywords    = {grimmsteig hessen nordhessen wandern},
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@electronic{www.nordhessen.de,
   title       = {Grimmsteig - Themenwege - Wandern und Nordic Walking - Aktivurlaub - Themen - Urlaub in der Grimmheimat Nordhessen}, 
   url         = {http://www.nordhessen.de/de/grimmsteig},
   biburl      = {https://puma.uni-kassel.de/url/871cb283c8e8f8f2bcbdf8f9bf27c2b0/stephandoerfel},
   keywords    = {geocaching grimmsteig wandern},
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@electronic{www.touren.gps-kassel.de,
   title       = {GPS-Koordinaten für Wanderungen um Kassel}, 
   url         = {http://www.touren.gps-kassel.de/},
   biburl      = {https://puma.uni-kassel.de/url/5a00db184ada1bf5389c67dd81f763e3/hotho},
   keywords    = {wandern gps kassel},
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