Statistics for occurrence #1 of “Blanche River” in chapter 5 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 3, 15th edition.:

...ans, pitched their tents on the banks of the Wabash; till, at last, in 1742, a few families of resident herdsmen gained permission of the natives to pasture their beeves on the fertile fields above Blanche River . That Louisiana extended to the head-spring of the Alleghany, and included the Laurel Ridge, the Great Meadows, and every brook that flowed to the Ohio, was, on the eve of the treaty of Utrecht, ...
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