Statistics for occurrence #1 of “St. Charles” in chapter 5, page 49 of William Hepworth Dixon, White Conquest: Volume 2:

...ue St. Louis was an afternoon drive for belles and beaux, where sparkling Creoles ruined their admirers with a smile; but since that period fashions have changed, and everyone now lodges at the Hotel St. Charles . The once fashionable hotel has sunk into a State capital; one wing of the old hostelry being
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