http://news.nationalgeographic.com/news/2010/12/photogalleries/101221-mars-p its-pictures-photos-science-nasa-space-caves/#/mars-pits-overview_30639_600x 450.jpg
- [Texascavers] New pictures of the Martian pits Marvin & Lisa
- RE: [Texascavers] New pictures of the Martian pits Geary Schindel