The collection consists primarily of correspondence sent to Foxcroft by five individuals: Aaron Burr, Sr. (1716-1757), Jonathan Dickinson (1688-1747), Moses Dickinson (1695-1778), Jeremiah Halsey (1735-1780), and Experience Mayhew (1673-1758). Multiple letters touch upon the early history of Princeton University as Jonathan Dickinson and Burr were the first and second presidents respectively. Others letters, notably those written by Jonathan Dickinson and Experience Mayhew, are largely concerned with matters of theology and the doctrinal splits spurred by the First Great Awakening, often mentioning other prominent ministers of the time including Gilbert Tennent, George Whitefield, and missionary David Brainerd. The escalation of a doctrinal disagreement between Dickinson and Mayhew can be traced through a number of letters and manuscripts written in response to one another. The collection also suggests Foxcroft essentially served as a literary agent for these two men. The papers include drafts and copies of sermons and remarks written by Dickinson and Mayhew, many unpublished; Foxcroft was asked to review them for content and facilitate their publication and distribution. Researchers should note the collection essentially consists of items written by others; Foxcroft's hand appears only in the occasional notation.