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Twentieth Century America: Home

A list of primary & secondary source databases for the study of 20th century America


This guide provides an overview of resources for research in colonial, revolutionary, and early national U.S. history, or what historian Karin Wulf and others have come more broadly to call "vast early America." You will find information on:

Reference works, such as the Oxford Bibliographies and Cambridge Histories

Subject databases for finding the latest journal literature

Primary source databases, both newspaper and digitized manuscript collections

How to find archival sources at Yale and beyond

Print, digital, and microform formats are all covered to provide a broader starting point for research.

Library Contact

James Kessenides, Kaplanoff Librarian for American History

Top Resources

Links to some best bets for research in the colonial, revolutionary, and early national eras. Be sure to check the remaining pages on this guide for more resources and suggestions.