Fonds consists mostly of cartographic materials relating to reconnaissance trips taken by R.C. Harris. The maps are both historic and those drawn up by Harris for his trips, incorporating old trails on current maps. While the inclusive dates of the map collection are from 1835 - 1981, the majority of these maps were created from 1880 -1930. They are organized according to a personal classification system maintained by R.C. Harris. The remainder of the fonds consists of surveys, plans, photos, correspondence, topographical notes, magazine and newspaper clippings, Harris research notes, books, reports, brochures, photocopies, and book reviews.

The fonds consists of corporate records, a research collection of Seaboard historical material used in the preparation of a corporate history, John A. Humbird's journals of his overseas trips for Seaboard (1937-1945) and photographs of Seaboard personnel, delegations, ships, ports, logging operations, and sawmills.

The fonds consists of business records of the Yorkshire Guarantee & Securities, Limited, The Yorkshire and Canadian Trust, Limited and The Yorkshire & Pacific Securities, Limited, Huddersfield, England concerning its B.C. operations. The records consist of those created at Head Office, Huddersfield, in its dealings with its Vancouver and Victoria offices. There are also books of account which appear to have been created in its Vancouver office. The records consist of legal documents (1889-1950) minutes (1906-1950) correspondence (1890-1964) and financial records (1889-1970), including registers, journals and ledgers (1889-1954). There are also records of the Canadian Mining Syndicate and the Vancouver Land & Securities Corporation. The fonds also includes photographs of the exterior of the Thos. Dunn and Company store, depicting goods ready for shipment from Vancouver to the Klondike and interiors and exteriors of the Yorkshire Building in the 1950s.

The collection consists of ledgers, account books, and sales receipts of merchants in Dawson City, Yukon, during the Klondike Gold Rush as well as correspondence, purchasing records, and production records for several placer mining companies in and around Dawson City in the 1940s and 1950s. The records of Klondike-era merchants include those of Marcus Rosenthal and Company, Barrett and Hull (1901-1904), William Barrett, Klondike Thawing Machinery Company (1911-1926), Landhal's Emporium (1906), and Rook Brothers (1905-1906). Records of placer mining companies include those of Clear Creek Placers Ltd. (1941-1956), Yukon Gold Placers Ltd. and subsidiary companies (1941-1956), Canadian Placers Ltd. (1940-1941), and Spruce Creek Placers Ltd. (1941-1956).