has subject area Appalachian Region - Pennsylvania Coal Tar Ecological and Environmental Phenomena - Cities Ecological and Environmental Phenomena - Rivers Environment and Public Health - Cities Environment and Public Health - Rivers Environmental Exposure - Environmental Monitoring Geographic Locations - Cities Geological Phenomena - Rivers Great Lakes Region - Pennsylvania Hydrocarbons, Aromatic - Polycyclic Aromatic Hydrocarbons Mid-Atlantic Region - Pennsylvania Polycyclic Compounds - Polycyclic Aromatic Hydrocarbons Public Health Practice - Environmental Monitoring Urbanization Water Pollutants, Chemical