Statistics for occurrence #1 of “the Alleghanies” in chapter 1.9 of Cambridge History of American Literature: volume 2:

... and Philadelphia still led, of course, in the number of these ventures, but every town of literary pretensions tried to maintain a magazine. The South had its fair share; and in the region west of the Alleghanies there was a surprisingly large number. Cincinnati and Lexington were the most important publishing centres in this region, but several less famous towns in the Ohio Valley had their literary period...
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