Collier's New Encyclopedia — Kentucky… (1921)
“ The Mississippi, Ohio, and Big Sandy rivers form over one-half the boundary line of Kentucky, and besides these the Licking, Kentucky, Salt, and Green lie entirely within the State. The Tennessee and Cumberland rivers rise in Virginia and Kentucky respectively, the Tennessee running through Tennessee and Alabama, and the Cumberland through Tennessee alone, enter the State and cross it in parallel courses and empty into the Ohio within 15 miles of each other. ”
