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Water-supply
Hydrology
2
Aqueducts
1
Population
1
Watersheds
1
name
Hering, Rudolph, 1847-1923
2
Philadelphia (Pa.). Water Department
2
collection
Maps of North America
2
place
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Philadelphia Region (Pa.)
Pennsylvania
2
Philadelphia
2
Philadelphia (Pa.)
2
Philadelphia Region
2
genre
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Thematic maps
Maps
2
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Philadelphia Water Department
2
division
Map Division
2
type
cartographic
2
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Surveys for a future water su…
Surveys for a future water su…