Guide to Research CollectionsHistorical Society of Dauphin County
Papers: 1 item (November 3, 1797) in Maclay estate papers.
Historical Society of Pennsylvania
Papers: Several Maclay papers (1767-1792) in the Simon Gratz collection, 1570-1919; and letters and documents in the Jacobs papers, 1681-1838; 1 item (April 25, 1790) in Logan papers; 11 items (March 30, 1789-April 30, 1790) in Tench Coxe papers; and 1 item (May 2, 1790) in Dreer collection.
Library of Congress
Papers: 1789-1791. 3 volumes. Journals kept while a member of the first United States Senate describing legislative and procedural debates, personal observations and accounts of the social life of the members of Congress.
Additional Papers: 1 anonymous letter (1790) attributed to Maclay; 2 items (January 30, February 4, 1790); 1 item (July 20, 1789) in George Washington papers; and 27 items (March 6, 1789-July 30, 1790) in Benjamin Rush papers.
Dawes Memorial Library
Papers: 1 item (February 9, 1790) in Charles Stack autograph collection.
Massachusetts Historical Society
Papers: 1789, 1796. 2 letters.
Pennsylvania Historical and Museum Commission
Papers: 15 letters and a memorial (1782-1790, 1793) contained in various collections. Finding aid. Also a will of William Maclay in the Maclay family papers, 1788-1933.
Pierpont Morgan Library
New York, NY
Papers: January 15, 1790. 1 item.
Seeley G. Mudd Library
Papers: 1 item (January 16, 1790) in general manuscripts collection.
National Museum of American History
Papers: 1 item (September 1, 1789) in Hull collection of letters concerning the Adams family.