Miller Brothers, Inc. was a Chinook, Cleveland, and Lloyd, Montana, sheep and cattle ranch operated by Henry G. Miller, his brother Chris D. Miller, and G.T. "Ted" Westin, son-in-law of Chris Miller. Records (1894-1966) include general correspondence, court papers, legal documents, and financial records documenting the operation of the ranch; and materials on the First National Bank of Chinook, which the Millers helped organize in 1909.