Zebulon Montgomery Pike (1779-1813) was an explorer and soldier, most often remembered two exploratory trips to the newly acquired Louisiana territory. The first of these trips was to the source of the Mississippi River in 1805; the second was to explore the headwaters of the Arkansas and Red Rivers in 1806. Because General James Wilkinson was responsible for organizing Pike's two expeditions, when the conspiracy charges again Aaron Burr implicated Wilkinson, suspicion was, for a short time, also focused on Pike. Pike worked his way up the ranks of the United States Army, becoming a brigadier-general during the War of 1812. He was killed in the Battle of York in Upper Canada (now Toronto) in 1813.

Partly copied by Redmond Conyngham from the state records and part from and with the reports of Judge Gibson and Judge Thomas Cooper. Relates to dispute over Wyoming valley lands between Connecticut and Pennsylvania. Includes correspondence of Lord Amherst, John Armstrong, Jr., Charles Biddle, John Boyd, Zebulon Butler, Thomas Cooper, Thomas Fitch, John Franklin, James Hamilton, Joseph Hamilton, William Montgomery, John Penn, Richard Rush, Jonathan Trumbull, and Roger Wolcott.

Transcripts and photocopies of Correia de Serra correspondence, made by Richard B. Davis for "The Abbé Correa in America," APS Transactions 45, 2 (1955). Seven mss. letters are also included.

These papers are principally personal correspondence of a father and son who were prominent Pennsylvania-German citizens, each of whom represented his district in Congress. Correspondents of the elder Muhlenberg include William Bigler, Simon Cameron, William J. Duane, John Meredith Read, and Richard Rush, and concern Democratic politics and Lutheran church business. Correspondents of the younger Muhlenberg include Benjamin H. Brewster, George M. Dallas, John K. Kane, Robert M. Patterson, and Seth Salisbury. There is also a group of letters to and from Muhlenberg relating to his biography of General Peter Muhlenberg, and a volume of commissions.