All Columbia dissertations are searchable by author and title through CLIO.  If you are looking for a dissertation by subject or department, and don't find it in CLIO, please Ask A Librarian for assistance.

ProQuest Digital Dissertations Database provides the full-text of nearly all Columbia dissertations completed since 1997 and full-text of some earlier dissertations.  It can be searched by author, school, or keyword in the title or abstract.