Other
Water-supply
12
Power utilization
5
Bridges
4
Toll bridges
4
Canals
3
History
2
Parks
2
Pollution
2
Rates and tolls
2
Reservoirs
2
Rowing
2
Schuylkill Permanent Bridge
2
Water
2
Water rights
2
Water-power
2
Women in the book trades
2
Athletic clubs
1
Cemeteries
1
Dams
1
Description and travel
1
Exhibitions
1
Ferries
1
Ice
1
Law and legislation
1
Navigation
1
Penn
1
Ponts
1
Power unilization
1
Pumping machinery
1
Pumping stations
1
Regattas
1
Rowing races
1
Team rowing
1
Tolls
1
Water supply
1
Water towers
1
Waterfronts
1
Waterworks
1