Good site Library of congress www.loc.gov click on using the library click on for researchers click on search on line catalog type in what you want State, city, Maps, a surname etc also has a collection of Sanborn fire insurance maps from 1800s to present maps include residential and business buildings with the owner of the building their web site is sanbornmap.com They are in Pelham NY on their web click on Traditional mapping Their parent co does historical maps (EDR) 1-800-352-0050 I am researching the surname BOWNE Thanks Audrey Seattle