http://members.tripod.com/~Jenn2000/main.html
http://www.ngdc.noaa.gov/seg/hazard/resource/geohaz/landsl.html
www.fiu.edu/~longoria/natural/mass/mmain.htm
http://gldage.cr.usgs.gov/html_files/nlicsun.html
http://www.unige.ch/hazards/
http://homepage.smc.edu/robinson_richard/massmovementlinks.htm