Oil producer. Henry Vernon Foster’s correspondence and business records (1872–1990) which detail the Foster lease in the Osage Nation, initiated in 1896; early discoveries of oil in the Osage Nation; the history of the Indian Territory Illuminating Oil Company; Foster’s discovery well in the Seminole field; and his Oklahoma #1 in the Oklahoma City field. Also included in the collection are contracts and other legal documents showing lease ownership and stock ownership of the I.T.I.O. Company (1900–1940); correspondence of Henry Foster (Henry Vernon Foster’s father); a ledger of shares in the I.T.I.O. company regarding start-up and leases; documents regarding negotiations of separation between Cities Service Oil Company and Foster Petroleum; documents regarding Foster’s businesses prior to his dealings in the Osage Nation; and business files (1900–1937) relating to Foster’s ranching activities.