Historic Preservation Resources: The dating of old houses: A paper read by Dr. Henry C. Mercer, of Doylestown, Pa., at a meeting of The Bucks County Historical Society, at New Hope, Bucks County, Pa., Oct. 13, 1923 by Henry Chapman Mercer, 1976, Shelf: 12. Books and Bound Manuscripts, FP.2016.004. Fairmount Park Historic Resources Archive. https://pprarchives.libraryhost.com/repositories/2/archival_objects/14015 Accessed June 09, 2025.