Don and Marietta Dorflinger began collecting postcards of the Delaware Water Gap area shortly after they moved to Blairstown, New Jersey, in 1986. The Dorflingers� first book, Orange, is also a par...ver maisDon and Marietta Dorflinger began collecting postcards of the Delaware Water Gap area shortly after they moved to Blairstown, New Jersey, in 1986. The Dorflingers� first book, Orange, is also a part of the Postcard History Series.ver menos