Scholar, diplomat, politician, and historian. Primarily writings by Baylies relating to the American Revolution, the Confederation and the Constitution, Alexander Hamilton, and the administrations of George Washington, John Adams, and Thomas Jefferson.

Author and biographer. Family and general correspondence; research notes; drafts of writings, speeches, and articles; publication production materials; clippings; scrapbooks; and printed matter relating primarily to Bowen's writings, especially her biographies of John Adams, Francis Bacon, Sir Edward Coke, Benjamin Franklin, and Oliver Wendell Holmes, and her study of the Constitutional Convention of 1787.

Correspondence, journal, essays, sermons, articles, autograph collection, photographs, and other papers of the Danforth and Bush families, chiefly of Joshua N. Danforth. A volume of autographs collected by J. Danforth Bush and other family members contains the signatures of members of the Thirty-third Congress (House and Senate) and U.S. governors, circa 1853-1854.

Economist and editor. Correspondence, project reports, writings, printed matter, and other papers relating chiefly to Kellock's work with the Federal Writers' Project, the Department of State, and the Department of Agriculture Resettlement Administration.

United States secretary of war, member of the Continental Congress from Maryland, Continental Army officer, and physician. Correspondence, financial records, diary, and other papers relating to McHenry's service as United States secretary of war in the administrations of George Washington and John Adams; and as a Continental Army officer, particularly as secretary to George Washington and on the staff of the Marquis de Lafayette.

Naval officer. Correspondence, journals, ship records, subject files, printed matter, and miscellaneous material relating to Patterson's naval career.

Governor of New Hampshire and legislator, United States senator from New Hampshire, essayist, and historian. Correspondence, diaries, letterbooks, autobiography, writings, notes, transcripts of poetry, essays, extracts, and other papers relating to Plumer’s personal life and career in New Hampshire and national politics and as an essayist.

Resident of Salem, Massachusetts. Letters, clipped signatures, and other autograph items of prominent American and a few British figures, chiefly of the nineteenth century.

Reports, notes, journals, letters, memoranda, and printed items documenting the drafting of the United States Constitution, the Constitutional Convention, and proposals relating to the Bill of Rights and subsequent amendments to the Constitution.

Original and reproduced records of the United States Continental Congress including letters and extracts from letters, circular letters, orders, resolutions, contracts, oaths of allegiance to the United States, financial documents, extracts from journals and minutes of the congress and its committees, committee reports, lists, and requisitions.

Papers and records collected by Henry A Willard II including Bradley-Willard family papers and correspondence, Willard Hotel records, miscellaneous business records, and autographs collected by Henry A. Willard I that include the signers of the Declaration of Independence, presidents of the Continental Congress, and related individuals.