Consists primarily of correspondence of nineteenth-century American astronomer Stephen Alexander.

Consists chiefly of correspondence between New Jersey mayor and governor Joseph Bloomfield and Nicholas Biddle, David Brearley, Aaron Burr, Thomas P. Johnson, Samuel McLane, Edward Miller, and Rev. Andrew Hunter.

Consists of correspondence and documents of carpenter-architect Robert Smith, the leading building professional in Philadelphia in the eighteenth century, chiefly concerning the building of Nassau Hall at The College of New Jersey (now Princeton University) and the house of the college president.