The Adams Family Papers Editorial Project Collection of the Massachusetts Historical Society comprised of over a quarter million manuscript pages of the letters and diaries of generations of John and Abigail Adams.
From the site:
The Adams Papers project was founded in 1954 to prepare a comprehensive published edition of the manuscripts written and received by the family of John Adams of Quincy, Massachusetts. The Adams Family Papers manuscript collection at the Massachusetts Historical Society forms the nucleus of the project. In addition, the editors have gathered over 27,000 copies of Adams items from hundreds of libraries, institutions, and individuals in the United States and abroad. The project's cut-off date is 1889, the year Abigail Brooks Adams died. The editors do not edit the Adamses words; rather, they continue the search for Adams documents, select the material to be included in the edition, provide a faithful transcription of the manuscripts, and supply annotation. To date, 36 volumes have been published by Harvard University Press.
The Adams Papers was funded originally by Time-Life Inc. and the Ford Foundation. At present funding is provided primarily by the National Historical Publications and Records Commission and the National Endowment for the Humanities, with additional funding from the Lyn and Norman Lear Fund, the Packard Humanities Institute, and private donors. Over the years, these supporters have included The J. Howard Pew Freedom Trust, The Andrew W. Mellon Foundation, and The Charles E. Culpeper Foundation through the Founding Fathers Papers, Inc.