The Columbus (OH) Metropolitan Library has Sanborn maps viewable online on their Electronic Resources site. To access them, you must have or obtain a CML library card number, which is available to any Ohio resident, through the library website homepage (takes a week or so to go through.) The CML Electronic Resources site also includes Heritage Quest & many other reference materials of interest. If you aren't an Ohio resident, perhaps you can locate a library in your home state which offers similar online services. Good luck. Wayne, Seneca Co., OH