 <a rel="nofollow" class="external text" href="http://minerals.usgs.gov/minerals/pubs/country/2001/lymyb01.pdf"><i>Mineral Industry of Libya</i></a></li>
<li>Thomas S. Ahlbrandt (2001) <a rel="nofollow" class="external text" href="http://pubs.usgs.gov/bul/b2202-f/b2202-ftextonly.pdf"><i>Sirte Basin Province: Sirte-Zelten Total Petroleum System</i></a> <a href="//en.wikipedia.org/wiki/U.S._Geological_Survey" title="U.S. Geological Survey" class="mw-redirect">U.S. Geological Survey</a></li>
<li><a rel="nofoll