| http://www.w3.org/ns/prov#value | - As you see around you, two breakwaters had to be built, involving an immense amount of labor and expense; for one of them is nearly 7,000, and the other a little more than 6,000, feet in length. "The highest level on the isthmus is 52 feet, so that they did not have to dig very deep anywhere; and there were several depressions in the level, which made the work still less.
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