Scope and Contents Personal papers and business records of three generations of the Johnston family, builders of dams and bridges in Maine. Included are materials of William Jasper Johnston; his son, William Percy Johnston; and Percy's son, Donald Percy Johnston. A few items belonging to John Johnston, father of Jasper Johnston are also found in the collection. The collection includes many photographs of dams and other construction projects of the Johnston family. Included are phorographs and negatives,...