Series I. Correspondence has been divided into Subseries A. Business and Subseries B. Personal. Each subseries has been arranged chronologically. Business correspondents include John B. Upton, Alfred L. Coffin, Thomas Smull, William B. Ware, George K. Benedict, William Quinn, Daniel R. B. Upton, R. W. Ropes, Williams Cummings & Son, Brown Shipley and Company, R. C. Lloyd, Thomas Brown and Company, and more. Personal correspondents include his wife, Mary C. Peck; his mother, Abigail S. Ware; his sister, Harriet Page; his father-in-law, William H. Peck; and William Prichard, among others.