PWD water tech at the Philly Home Show, 1960 (detail)
Outside Sprinkling Filters, Spring Garden Sewage Experiment Station, 1911
State Road triple pipeline construction, 1904
Upper Roxborough Filter Beds Complete, 1903
Includes activities to maintain the healthfulness of the city, and the animals (such as pigs) and diseases (such as cholera, yellow fever, and typhoid fever) that were the objects of public health efforts.