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University Library, University of Illinois at Urbana-Champaign
Online version of the 3 volume original. Substantive, signed entries on broad topics organized by time periods and themes. Entries include bibliographies. Some bibliographies list both primary and secondary sources.
2 vols. Online resource. Also available in print through our catalog. A little old, but still highly regarded, and useful as a starting point into just about any historical topic. An excellent introduction to historiographical themes and seminal works.