This volume meticulously charts the evolving administrative and geographical divisions of Philadelphia and its surrounding counties from the province's inception to the late 20th century. The book details the formation of Pennsylvania's initial counties and the subsequent establishment of Berks and Montgomery counties, providing context for where historical records can be found. It traces the intricate changes in township lines and significant consolidations, such as the 1854 merger of the city and county of Philadelphia, culminating in a comprehensive overview of ward boundaries up to 1982.

This historical atlas serves as a vital resource for understanding the administrative and territorial development of Philadelphia and its environs. The collection of maps provides a clear visual narrative of how the region's geography and governance structures transformed over three centuries. It is particularly valuable for researchers and historians needing to pinpoint locations and understand administrative contexts from different periods. The inclusion of maps up to 1982 ensures its relevance for a broad historical scope.