The collection pertains chiefly to investments in lands in New York State, Illinois, Iowa, Kansas, Michigan, Minnesota, and Nebraska, to interests in mining, railway, mercantile, banking, and other business ventures, and to the settlement of family estates.

Correspondence, reports, accounts, journals, and other papers relating to Robie's legal business and to his investments in western lands. Includes papers dealing with the management of the estates and trusts of Charles Davenport, and of William S. Shephard and his descendants, as well as numerous smaller estates; also, papers relating to a mercantile business begun in Bath by Robie's father, and a few letters pertaining to family and personal matters.