Philadelphia Area Archives Research Portal (PAARP)

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Aeronautics ‎(4)
Airplanes ‎(4)
Airports ‎(2)
Airships ‎(3)
Alcoholism ‎(1)
Architecture ‎(2)
Authors ‎(1)
Autogiros ‎(2)
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Biplanes ‎(1)
Bookbinding ‎(1)
Botany ‎(1)
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Chemists ‎(1)
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Electricity ‎(3)
Engineering ‎(8)
Germany ‎(1)
Helicopters ‎(1)
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Iron ‎(1)
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Machinery ‎(4)
Metallurgy ‎(1)
Moon ‎(1)
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Paper mills ‎(1)
Patents ‎(3)
phases ‎(1)
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Purification ‎(2)
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Safety paper ‎(1)
Science ‎(9)
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Shipbuilding ‎(1)
Ships ‎(3)
Sports ‎(1)
Steel ‎(1)
Technology ‎(5)
Temperance ‎(1)
Travel ‎(7)
Triplanes ‎(1)
Water ‎(3)
Waterways ‎(2)
Waterworks ‎(2)