when canals and eventually railroads reached into the region, there were substantial supplies of coal that was |
once canals and eventually railroads reaching into the region, there were substantial supplies of coal having been |
with canals and eventually railroads reaching into the region, there had been substantial supplies of coal |
canals and eventually railroads reached into the region, with substantial supplies of coal being |
as canals and eventually railroads reached into the region, substantial supplies of coal were |
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