Southwest Sewage Treatment Plant under construction, 1949
Emscher Tank Installation at Essen Nord, Germany
Sludge Drying Beds, Essen Nord, Germany
Grit Chamber, Essen, Germany
Effects of Expansion of Gas Bubbles in Enscher Sludge Shown in Right-Hand Cylinder
Sludge Presses for Grease Recovery, Bradford, England
Drain water from sludges obtained from sedimentation, septic and Emscher tanks
Thomas Run sewer outlet at Cobbs Creek
Thomas Run sewer outlet during construction
Delaware River at Arch Street from the New Jersey side, 1914