DF Gibson performed the Historic Sites Survey and Master Plan Phase I & II for structures in towns along this early 19th Century canal. This survey and preservation master plan examined the historically significant buildings and infrastructure elements adjoining the Delaware and Raritan Canal and fourteen towns along its route, including Lambertville, Griggstown, Port Mercer, Princeton Basin, Titusville, East Millstone, Raven Rock, Blackwell’s Mills, Stockton, and Trenton. The eleven nominations to the National Register of Historic Places is the largest number ever to have been generated from a single study.
The original Historic Site Survey and Master Plan was groundbreaking for its time. It laid the groundwork for the economic redevelopment of this historic piece of the nation's transportation infrastructure. The D&R has proven to be a model for many similar redevelopments occurring throughout the United States.