Lettercopy and letterpress books (1802-1880), daybooks (1800-1867), cashbooks (1829-1876), ledgers (1796-1878), and other business records of the firm founded by Alexander Brown in Baltimore, Md., circa 1800 which grew from a mercantile business into an international banking house.

Merchant trading and shipping family of Ireland, South Carolina, and Boston, Massachusetts. Letterbooks, correspondence, wills, a petition, financial papers, printed matter, and other material pertaining chiefly to Thomas Amory (1682-1728) and his grandson, Thomas Amory (1762-1823).

Naval officer. Correspondence, subject files, logbooks, memoranda, blueprints, photographs, printed matter, and other papers relating primarily to Chambers's service in the navy and with the Greely Relief Expedition to the Arctic and the Nicaragua Canal survey expedition of 1884-1885.

Naval architect. Correspondence, blueprints, newspaper clippings, and photographs relating to the restoration of the Constitution (frigate) and the Constellation (frigate).

Engineer and inventor. Correspondence, writings, design specifications, articles, memoranda, technical notes, financial and legal papers, drawings, printed matter, and miscellany relating primarily to Ericsson's activities in marine engineering, especially his work on screw propellers and his design of the steamship Princeton and the ironclad Monitor. Includes correspondence of Ericsson's biographer, William C. Church.

Naval officer and United States representative from Alabama. Correspondence, memoranda, speeches, lectures, articles, reports, notes, analyses, naval orders, press clippings, photographs, and other papers relating chiefly to Hobson's naval career and to his efforts on behalf of prohibition, restrictions on international drug trafficking, and opposition to the Franklin D. Roosevelt administration.

Naval officer and historian. Correspondence, family papers, subject files, speeches and writings, scrapbooks, biographical file, printed matter, and other papers relating to Mahan’s naval career, writings, and personal and family life.

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.

Seafaring and merchant families. Correspondence, logbooks and journals, ships' papers, financial and business records, and printed matter documenting the voyages and business activities of Nathaniel Brown Palmer, Alexander Smith Palmer, Richard Fanning Loper, and other members of these maritime families of Stonington, Connecticut.

Naval officer. Correspondence, subject file, and miscellaneous material relating to Sicard’s naval career, including diagrams and memoranda for breech-loading howitzers and his plans for steel armor plate for ships.