WorldCat lets you identify books held by other libraries that you may be able to borrow from interlibrary loan.
Good for: Searching books and periodicals, including full text access to those in the public domain and limited search for those still under copyright.
Contains: Scanned books and periodicals
Current overviews of scholarship
Scholarly research reviews and historiographical essays published in the Oxford Handbooks series. Use these to get an overview of how historians have approached a topic.
Older guides for use doing historiography
Dissertations
Dissertations generally have excellent bibliographies and often include a section that reviews scholarship done on a topic.
Good for: Dissertations and theses.
Contains: Citations, abstracts, and full text of dissertations and theses.
Dates covered: Citations from 1861, abstracts from 1980 for dissertations and 1988 for theses, full text from 1996 for UNLV items and 1997 for most others.