topic

• Hydrology1
• Water-supply1

name

• Hering, Rudolph, 1847-19231
• Philadelphia (Pa.). Water Department1

collection

• Maps of North America1

place

• Pennsylvania1
• Philadelphia1
• Philadelphia (Pa.)1
• Philadelphia Region1
• Philadelphia Region (Pa.)1

genre

• Maps1
• Thematic maps1

publisher

division

• Map Division1

type

• cartographic1