@electronic{www.osm-3d.org,
   title       = {OpenStreetMap Globe Webstart en}, 
   url         = {http://www.osm-3d.org/Start.en.htm},
   biburl      = {https://puma.uni-kassel.de/url/e09d37f7abd19af0e9112c5c1d3abe7e/stumme},
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@electronic{www.alongthepike.com,
   title       = {Improving Bikeplanner.org's map data}, 
   url         = {http://www.alongthepike.com/archive/2012/09/11/improving-bikeplanner-orgs-map-data.aspx},
   biburl      = {https://puma.uni-kassel.de/url/2cb8f0a4e38f967b36ffa928ae70c271/stumme},
   keywords    = {map open osm street},
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@electronic{blog.openplans.org,
   title       = {Submit updates to OpenStreetMap | OpenPlans}, 
   url         = {http://blog.openplans.org/2012/10/submit-updates-to-openstreetmap/},
   biburl      = {https://puma.uni-kassel.de/url/a34873809043857a2b8bfda6cf63828a/stumme},
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@electronic{www.geofabrik.de,
   title       = {GEOFABRIK // Presse}, 
   url         = {http://www.geofabrik.de/geofabrik/press.html},
   biburl      = {https://puma.uni-kassel.de/url/817299928aebb5c632785f25ed8efea1/stumme},
   keywords    = {geo map osm},
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@electronic{wheelmap.org,
   title       = {Wheelmap - Rollstuhlgerechte Orte finden}, 
   url         = {http://wheelmap.org/},
   biburl      = {https://puma.uni-kassel.de/url/91d69ba6c46a6207005faba256550fa3/stumme},
   keywords    = {Map OSM Open Rollstuhl Street orte rollstuhlgerechte wheelmap},
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@electronic{topo.geofabrik.de,
   title       = {OSMC Reit- und Wanderkarte}, 
   url         = {http://topo.geofabrik.de/},
   biburl      = {https://puma.uni-kassel.de/url/8a0be07f22455fd9850413b90b1f3f8f/stumme},
   keywords    = {everyaware karte map osm topo wanderkarte},
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@electronic{unterbahn.com,
   title       = {Unterbahn » Blog Archive » Serving ‘OSM-JSON’ alongside XML from the OpenStreetMap Rails port}, 
   url         = {http://unterbahn.com/2009/07/serving-osm-json-alongside-xml-from-the-openstreetmap-rails-port/},
   biburl      = {https://puma.uni-kassel.de/url/b8ffb098ea5fbfbfc44cd823f5d9e982/stumme},
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