Why search here? You want to read summaries of previous research on a topic, giving you historical context and current understanding of the subject, as well as a list of sources to consult.
What's included? Over 30,000 literature reviews in the Biomedical, Life, Physical, and Social Sciences, dating back to 1932.
Why search here? You want to read graduate student dissertations and theses on a topic - often giving you extensive bibliographies, and occasionally cutting edge research on new topics.
What's included? Index of doctoral dissertations and some master's theses from most North American and many European colleges and universities. Starts in 1743. Full text is available for over 1 million, mostly since 1996.