Newspaper Clipping Scrapbooks of Frederick Graff Jr., Chief Engineer of the Philadelphia Water Department. Part 2: 1858-1871
Half a Century of Clean Water: The Clean Water Act, 1972-2022
Wood truss drawbridge, Orthodox Street over Frankford Creek, 1899 [Detail]
New Mill House at Fairmount
View of Fairmount Water Works, ca. 1827