The materials in this collection represent the business papers of Rockwell with the majority of items pertaining to the Norwich & Worcester Railroad Company. Box 1 includes three folders of Rockwell's correspondence arranged in alphabetical order by writer. Most of the letters pertain to his business interests in railroads. Also, there are some legal documents and business records. Folder 4 has business papers of Rockwell and other family members including receipted bills and promissory notes, 1798-1866, and folder 5 has the personal papers of Rockwell and family members including correspondence to him from his brother pertaining to railroad business, 1825-1859. The last folder of Box 1 contains what appears to be Rockwell's manuscript copy of his 1860 pamphlet States versus Territories, A True Solution of the Territorial Question. Box 1 also includes a bound account book (67 leaves, most blank and many torn out) for the period c. 1805-c. 1830s. It has been attributed to Betsey Rockwell. In addition to records of personal expenses, it seems to include records in the earlier years for a small business of selling milk and butter. There are also brief diary entries, some of which mention the activities of John and Charles. It is possible that the volume was kept by more than one person. Box 2 and the first three folders of Box 3 contain business records of the Norwich & Worcester Railroad Company, 1832-1859, arranged in chronological order. Folder 4 of Box 3 has materials pertaining to proposals for various canals, most of them in the New England area, 1821-1839 (many items undated). Folder 5 of Box 3 has correspondence and business papers of the Norwich Steamboat Company, 1827-1832. There are bills and accounts for the Steamboat Victory, 1831-1832; and there is one letter pertaining to the Norwich & New London Steamboat Company, 1858. Folder 6 of Box 3 has miscellaneous materials pertaining to various railroads in the United States and England, 1832-1867. These materials include business records, printed materials, newsclippings, correspondence, legal documents, and a few printed maps.