The purpose of the Greater Philadelphia GeoHistory Network is to gather geographic materials useful for the study of historic Philadelphia and its region. This site contains thousands of old maps, property atlases, city directories, industrial site surveys, and other items documenting the history and development of the city from the 1600s through today.
The Balch Institute is part of the Historical Society of Pennsylvania. The website can provide you with background information on many ethnic groups in Philadelphia, and the neighborhoods they created