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Canal - Wikipedia
list of canals - Encyclopedia Britannica
canals and inland waterways - Encyclopedia Britannica
Canals and inland waterways - US History, Construction, Navigation
What is a canal? - NOAA's National Ocean Service
Where, Who, How? - The American Canal Society
Structures description - The American Canal Society
What is a Canal? 12 Types of Canals - Civil Engineering
Home - The American Canal Society
The Canal Era [ushistory.org]