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Frederick Graff maps, technical drawings, and plans on Philadelphia (Pa.) water engineering projects, circa 1683-1875
Held at: The Historical and Interpretive Collections of The Franklin Institute [Contact Us]
Held at: The Historical and Interpretive Collections of The Franklin Institute [Contact Us]
Held at: Friends of Northeast Philadelphia History [Contact Us]
Held at: First Unitarian Church of Philadelphia Archives [Contact Us]
Held at: Goschenhoppen Historians, Inc. [Contact Us]
Held at: Germantown Historical Society [Contact Us]
Held at: Germantown Historical Society [Contact Us]
Held at: Germantown Historical Society [Contact Us]
Held at: Germantown Historical Society [Contact Us]
Held at: Haverford Township Historical Society [Contact Us]
Held at: Historic Langhorne Association [Contact Us]