According to the bibliograph of AFTER THE REVOLUTION by Barbara Clark Smith, much of the work on the SPRINGER family relied on two unpublished works: William S. Pretzer, THE DELAWARE LOG HOUSE; A SOCIAL AND ECONOMIC REPORT, and Del Upton, ARCHITECTURAL SURVEY OF THE DELAWARE LOG HOUSE. Does anyone know if either of these works has been published? I would like to see or purchase THE DELAWARE LOG HOUSE if it is available. Can anyone tell me the current status of these works. Thank you for your help. Marty Fulton