The collection consists of the records of the Columbia River Fishing and Trading Company, a firm organized in 1834 by Nathaniel J. Wyeth. These records include three ledgers: a ledger containing financial records and Wyeth's instructions to Robert Evans, agent in charge, 1834-1837; a financial journal for transactions made from 1834-1835; and a financial journal including Joseph Thing's accounts of the sale of Fort Hall to the Hudson's Bay Company, 1834-1839. Other materials consist of a letter book with handwritten copies of letters, agreements, and instructions relating to the company's formation and operation and the establishment of Fort Hall; and loose papers. Principal correspondents in the collection include Nathaniel J. Wyeth, Joseph Thing, James L. Lambert, and the firm Tucker & Williams. The collection also includes microfilm copies of the ledgers and the letter book.