http://www.ifremer.fr/francais/produits/zaiango/hydrates.htm
http://www.pgc.nrcan.gc.ca/marine/french/hydpap.htm
http://sts.gsc.nrcan.gc.ca/beaufort/atlashtml/francais/hydrates.htm
http://www.hydratech.bham.ac.uk: European project on gas hydrates
http://www.vulkaner.no/v/volcan/bcmudvol.html
http://news.bbc.co.uk/1/hi/sci/tech/1626310.stm
http://www.yellowstonenationalpark.com/mudvolcano.htm
http://www.disasterrelief.org/Disasters/010525Trinidad/
http://www.gstt.org/teaching/mud%20volcanoes.htm
http://www.volcanolive.com/mud.html
http://www.geo.vu.nl/~zitt/mudvolc.htm