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Coal mining company. Correspondence, financial reports, leases, legal reports, and general reports, all dated 1903–1944, regarding the operation and management of the Kali-Inla Coal Company of Hartshorne, Indian Territory, and Oklahoma, and that of its subsidiary coal companies and related firms. Special correspondence files include those regarding labor union activity, mining accidents, company housing, relations with railroads, and insurance. Also included in this collection are equipment catalogs (ca. 1910–1944) containing advertisements and information regarding miner and mining supplies. In addition to reflecting the mining industry in Oklahoma, the collection also contains information on mining operations in Colorado, West Virginia, and Arkansas. Kali-Inla Coal Company Photograph Collection also in repository.