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Subjects
- Rivers--Surveying1
- Battering Rams1
- Bridges, Suspension[remove]1
- Bridges--Design and construction--Costs1
- Bridges--Law and legislation1
- Bridges--Pennsylvania--Schuylkill River1
- Canals, Interoceanic1
- Canals--Design and construction--Costs1
- Canals--rates and tolls1
- Civil Engineering--Early works to 18501
- Civil Engineering--History1
- Economics--Transport1
- Mountain Railroads--United States1
- Mountain passes--Blue Ridge Mountains1
- Public works--New York (State)--Niagara Falls1
- Railroads--Design and construction1
- Railroads--Design and construction--Costs1
- Railroads--Freight--Rates1
- Railroads--United States1
- Stream channelization1