African-American State Historical Markers . Social Science and History Department vertical files. Shelved with 929.1. The Map Department has one of the best collections of Philadelphia maps in the world. Included in the collection are ward atlases, Hexamer and Sanborn Fire Insurance Atlases, Hexamer General Industrial Surveys, aerial photographs, genealogies of political subdivision boundaries, and street name changes.
Many early maps show land owners.
Ask the map librarian for assistance. Philadelphia Street Name Changes. Descriptive List of the Map Collection in the Pennsylvania State Archives. Land Ownership Maps in the Library of Congress . Print and Picture Department.