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Time Periods
1850-1900
Thomas Mill Covered Bridge over Wissahickon Creek (Picturesque America)
A Day in the Ma’sh – Oil Refinery
Wood truss drawbridge, Orthodox Street over Frankford Creek, 1899 [Detail]
Bridge Street Draw, July 26, 1897
Engine House, Belmont Works
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
Baldwin Locomotive Works
Jonval Turbines at New Mill House, 1870