To find books on the subject, search for "landslides"; "geological hazards"; and "geohazards" in the Library catalog. You may also find articles in the ASCE Digital Library database. Also check the Natural Resources Canada website for information on natural hazards, and see GoogleBooks for a digitized book on the incident entitled "Report on the Landslide at Notre-Dame de la Salette". You will find scientific articles on Leda clay on the Internet in the Archive of Clays and Clay Minerals, 1952–2001.