The collection pertains to D.T. Willis’ career and involvement in construction projects throughout British Columbia predominately between 1948 and 1962. The collection includes numerous groups of photographs documenting the opening of the Hope-Princeton Highway, BC Department of Public Works construction projects and personnel, Engineering Conferences, BC Public Works Events and a 1948 image of the original 1880's wagon trail between Hope and Cache Creek, BC. Numerous photographs have annotations on the back, identifying subjects, dates, and contextual information. Textual materials also appear in the Collection, including a commemorative pamphlet for the Hope-Princeton Highway opening, car mileage recordings for several roadways, photograph indexes and identification sheets.