Nordalaskanischer Methanhydrat-Körper
<ul><li>map data: United States Geological Survey (USGS), Timothy Collett</li>
<li>background:
<ul><li>Kartendaten: OpenStreetMap-Mitwirkende</li>
<li>SRTM-Relief: NASA</li>
<li>Rendering: OpenTopoMap</li></ul></li>
<li>Location map: <a href="//commons.wikimedia.org/wiki/User:Alexrk2" title="User:Alexrk2">Alexrk2</a></li>
<li>Rendering complete map: <a href="//commons.wikimedia.org/wiki/User:Pechristener" title="User:Pechristener">Pechristener</a></li></ul>
CC BY-SA 3.0
<ul><li>map data: <a rel="nofollow" class="external text" href="https://www.usgs.gov/media/images/northern-alaska-and-potential-gas-hydrate-occurences">Northern Alaska and potential gas hydrate occurences</a></li>
<li>background: OpenTopMap</li>
<li>Location map: <a href="//commons.wikimedia.org/wiki/File:USA_Alaska_location_map.svg" title="File:USA Alaska location map.svg">USA Alaska location map.svg</a></li></ul>