Official and family correspondence, journals, manuscript drafts of Roberts' book Embassy to the Eastern Courts of Cochin-China, Siam, and Muscat . . . During the Years 1832-3-4 (1837), diplomatic documents (1832-1836), legal and financial papers, and miscellaneous items consisting of maps, drawings, and printed material. Documents Robert's service as a special agent of the U.S. to negotiate treaties with Siam, Muscat, and Cochin China, and his difficulties in obtaining remuneration from Congress for expenses incurred during his voyages. Correspondents include Mahlon Dickerson, Edward Livingston, Eugene A. Vail, and Levi Woodbury.