Correspondence, legal papers, drafts of addresses, and notes relating mainly to Borah's law practice. Includes papers relating to the Republican Party; the Western Federation of Miners' conspiracy cases involving William D. Haywood and the assassination of Frank Steunenberg; William H. Dewey's mining and railroading enterprises; the Barber Lumber Company, the Potlatch Lumber Compay, and the Pacific and Idaho Northern Railway.