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Population
Enslaved persons
1
Hydrology
1
Slavery
1
Water-supply
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name
Graham, H. S. (Henry S.)
1
Hergesheimer, E. (Edwin)
1
Hering, Rudolph, 1847-1923
1
Leonhardt, Theo. (Theodore), 1818-1877
1
Philadelphia (Pa.). Water Department
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collection
Maps of North America
2
place
Pennsylvania
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Philadelphia
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Philadelphia (Pa.)
1
Philadelphia Region
1
Philadelphia Region (Pa.)
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Thematic maps
Maps
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Census Office, Dept. of the Interior
1
Philadelphia Water Department
1
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Map Division
2
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cartographic
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Surveys for a future water su…
Map showing the distribution …