The Harry F. Miller File contains contracts, financial material, correspondence, interoffice communications, and other legal and business records that were maintained by Miller in his capacities as Edison's personal business secretary and as an official in several Edison companies. The items for 1900 include statements of Edison's account with the Galisteo Co. for expenses involved in gold ore experiments; an agreement with the American Mutoscope & Biograph Co.; and documents pertaining to bond transactions and stock options involving the Edison Phonograph Works and Edison Portland Cement Co.