Diagram from sewage treatment plan for Philadelphia, 1912
Centre Square Water Works, Drawings of Intake Basin
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
Plan and profile of proposed Delaware Seventh St. Sewer, 1850
Plan of Pine Street Sewer, 1830
Fairmount and vicinity, 1839
Isometrical View of Fairmount Water Works, 1843
Steam engine drawing, Frederick Graff Sr., 1815
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia