Subjects 1914 Sewage Treatment Plan

Black-and-white line graph showing two jagged lines on a grid

Diagram Showing Decreased Amount of Dissolved Oxygen in Delaware River, 1913

Black-and-white image of a body of water with trees and shoreline in the far distance

Delaware River at Arch Street from the New Jersey side, 1914

Black-and-white image showing sewer outlet, retaining walls and body of water

Cohocksink Sewer System outlet at Laurel Street

Black-and-white image of a table with numbers in columns

Bacteria in Delaware River, Torresdale Filters, 1913