Indexes virtually all doctoral dissertations and many masters theses produced in the U.S. since 1861. Dissertations from other countries date back to 1637. Abstracts available from 1980. Full text for dissertations being added continually. Most since 1997 are full text, though some authors choose to not make their work available. Print and microfilm copies are offered for a fee, but check out Interlibrary Loan before paying for a copy.