The bulk of the Simpson family papers consists of correspondence and photographs. Most of the correspondence, which is contained in seven folders, covers 1929-1939, the period during which the carriage road system was completed. The principal correspondents are Paul D. Simpson and Rockefeller and his office staff. The intimate nature of the working relationship between the Simpsons and Rockefeller is evident from their familiar, sometimes daily correspondence, which discusses construction techniques and problems, the establishment of boundary lines, and neighbors' concerns about the project. Other topics include the purchase of land lots, the placement of the roads, legal and engineering issues, and the countless minutiae generated by the long-term, extensive construction project. There also are scattered letters to and from other members of Rockefeller's design team, including the Olmsted Brothers firm, Grosvenor Atterbury, who was the architect for the Jordan Pond and Brown Mountain gatehouses, and Beatrix Farrand.