[06:28.31]During the first third of the century,however
[06:31.05]tranportation on river
[06:32.78]lakes and canals aided greatly in the growth of the United States.
[06:37.11]Next week we'll discuss the railroads in greater detail.
[06:41.01]17. What is the main idea of this lecture?
[06:45.34]18. When was inland waterway travel most popular?
[06:50.54]19. What was usually transported from west to east?
[06:55.71]20. What was NOT a result of the inland water system in the United States?
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