Dissertation Abstracts Online Covers every doctoral dissertation completed in the U.S. at accredited institutions for the last 150 years. Includes some master's theses and foreign language dissertations. For dissertations at USC, see Dissertations at USC. Period covered: 1861- (indexing); 1980- (abstracting dissertations); 1988- (abstracting theses) Selected by: pcorley@usc.edu Restrictions: USC only