


Emscher Tank Installation at Essen Nord, Germany

Thomas Run sewer outlet at Cobbs Creek

Thomas Run sewer outlet during construction

Cohocksink Sewer System outlet at Laurel Street

Pipe Test, 1914

Plan for the Collection, Treatment and Disposal of Sewage, 1914

Pennypack Sewage Treatment Works, 1914

Outside Sprinkling Filters, Spring Garden Sewage Experiment Station, 1911
