The Broadwater-Pepin Company was a Havre, Montana, general mercantile and licensed trading company opened in 1891 by E.T. Broadwater and Simon Pepin. There was a branch store in Browning, the Broadwater-Pepin Trading Company. The collection (1898-1931) includes outgoing correspondence, financial records, and subject files relating to the operation of the two businesses.

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.