1996. Water Department - Information Systems & Technology. Planimetric Coverage containing the delineation of topographic contours. Annotation of Contour Line elevations exists. Annotation viewable at 1" = ... City of Philadelphia, Pennsylvania.
1950. Storm Prediction Center. Data includes location touchdown points and corresponding dates of Tornadoes in Pennsylvania from 1950 to 2004, according to the National Weather S... City of Philadelphia, Pennsylvania.