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Aqueducts
Hydrology
1
Water-supply
1
name
Hering, Rudolph, 1847-1923
1
Philadelphia (Pa.). Water Department
1
collection
Maps of North America
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place
Pennsylvania
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Philadelphia
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Philadelphia (Pa.)
1
Philadelphia Region
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Philadelphia Region (Pa.)
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Maps
Thematic maps
1
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Philadelphia Water Department
division
Map Division
1
type
cartographic
1
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