Van Horne to Mellen, July 11, 1893, enclosure with Mellen to Oakes, July 15, 1893, NP, LRR, PV, 137.H.6.4 (F).
For a far more positive view of Hill, see the hagiographic biography Albro Martin, James J. Hill and the Opening of the Northwest(St. Paul: Minnesota Historical Society Press, 1991, orig. ed. 1976).