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Time Periods
1850-1900
Frankford Pumping Station Plans and Diagrams, 1870s
69th St. Sewer and Culvert across Lansdowne AVe.
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
Plan of Lemon Hill and Sedgley Park, Fairmount and Adjoining Property, 1851