The Thomas Jefferson papers
by Library of Congress. Manuscript Division
ArchivesPresidentsSourcesPolitics and governmentForeign relationsNational librariesLettersUnited States. Library of Congress. Manuscript Division
"The complete Thomas Jefferson Papers from the Manuscript Division at the Library of Congress consists of approximately 27,000 documents. This is the largest collection of original Jefferson documents in the world. Document types in the collection as a whole include correspondence, commonplace books, financial account books, and manuscript volumes. The collection is organized into ten series or groupings, ranging in date from 1606 to 1827."
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Book data: Open Library