The fonds consists of financial records of the Humbird family and records of various companies in which they had interests, including: Victoria Lumber and Manufacturing Company, Limited; Clearwater Timber Company; Humbird Lumber Company, Limited; Jacob Humbird Holding Company; White River Lumber Company; and Seaboard Shipping Company Limited.

Fonds also includes photographs, family financial records (distinct from company financial records), legal records, maps, correspondence, and press clippings. Photographs include photograph albums of the Victoria Lumber and Manufacturing Company Limited, an album of photographs pertaining to the family's interests in Mason and Clayton, Wisconsin, and Sandpoint, Idaho, and photographs of family members and employees of the companies. Family financial records include records pertaining to the estates of Jacob Humbird and the elder John A. Humbird, as well as financial record books of John A. Humbird and Thomas J. Humbird. Legal records include contracts, tie notices and permits, wills, and various land use records. Some maps show various company holdings, others are road maps. Correspondence is divided between company business and historical research about the companies (by family members). Press clippings are predominantly about the Chemainus and Mason operations.