Search for published primary sources in CatalogUSMAI or Worldcat. Use your topic as a keyword or subject AND the term "sources or documents or narratives" as a second subject term. This is what identifies titles having primary sources.
Additional terms 'papers', 'diaries', 'correspondence' as well as 'sources or documents or narratives' will expand a search for primary sources. Searches can also be narrowed by adding additional subject terms for events or periods.
ArchiveGrid is a database for searching through historical documents, personal papers, and family histories held in archives around the world. Thousands of libraries, museums, and archives have contributed nearly a million collection descriptions. Records include collection descriptions, content notes, links to Finding Aids (if available) and contact information.
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OAIster is a catalog of digital resources from open archive collections representing multidisciplinary resources from more than 1,100 contributors worldwide. Records contain a digital object link allowing users access to the object in a single click.
the English Short Title Catalogue (ESTC) provides bibliographic records for all known British printed material before 1801, held by the British Library and over 2000 institutions worldwide. The file will be made freely available to researchers as of Oct.