The fonds consists predominantly of textual, graphic, and cartographic materials documenting the efforts of Harley Hatfield, in conjunction with the Okanagan Similkameen Parks Society, the Wilderness Advisory Committee, and the Okanagan Historical Society, to establish the Cascade Wilderness area and the Hudson's Bay Company and Okanagan Brigade. The fonds also includes textual records illustrating Hatfield's research into old fur trading routes in that area. Additional material document facets of Hatfield's personal life and other interests.