This series includes cash books, costs sheets, inventories, journals, ledgers, stock records, store reports, pay records, and other financial reports and data from the Copper Range Company and its subsidiaries.

The cost sheets (monthly and annual) are particularly valuable as an overview of the activities of each company.

Note that Copper Range Railroad Company, Copper Range Motor Bus Company, and Copper Range Foundation financial records can be found in Series IX: Subsidiary Companies Records. Financial records from related companies can be found in Series VIII: Related Companies Records.