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E.g., literature near/3 review (ProQuest)
The work of doctoral students, dissertations may never be published in book form, but they can be rich resources. They invariably include a lit review as a chapter, and often have extensive bibliographies.
Indexes most peer reviewed journals in science, technology, and medicine, and many in the social sciences, arts, and humanities. Scopus also includes a number of trade publications and conference papers, and can perform author and affiliation searching.
Access to Google Scholar with Penn-only links to full-text articles. Once authenticated through Penn's proxy, full-text articles to which Penn Libraries subscribe will become available within the Google Scholar search results.