Statistics for occurrence #1 of “Sangamon river” in chapter 6 of William H. Herndon, Jesse William Weik, Herndon's Lincoln: The True Story of a Great Life, Etiam in minimis major, The History and Personal Recollections of Abraham Lincoln by William H. Herndon, for twenty years his friend and Jesse William Weik:

...very one save three. It may not be amiss to explain the cause of this remarkable endorsement of Lincoln by the voters in New Salem. It arose chiefly from his advocacy of the improvement of the Sangamon river . He proposed the digging of a canal a few miles east of the point where the Sangamon enters the Illinois river, thereby giving the former two mouths. This, he explained to the farmers, would prev...
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