Ann Arbor, biennial. Lists hundreds of machine readable data files. Indexes North American dissertations and some European ones, 1861- to date. After 1980 database contains abstracts in addition to bibliographic information, and provides full text for about 70,000 recent dissertations. Searchable in various ways.
Dissertation abstracts international.
Compilation of abstracts of doctoral dissertations submitted to University Microfilms by cooperating universities. Dissertations may be purchased in various formats. Varying forms of indexing. Related indexes for retrospective dissertations and dissertations not filmed. Issues list about 1,000 annotated citations on the literature of population, including lists of newly appearing census reports and surveys from around the world.