Statistics for occurrence #1 of “Mississippi river” in article pos=9 of The Daily Dispatch: December 17, 1862., [Electronic resource]:

...t one evil day the head of it went down into Egypt, "bucked" against Pharaoh, and came back with nary shekel, having lost them all in that interesting game. From that time till the discovery of the Mississippi river , the family was too poor to have a name. Stonewall's grandfather ran a flatboat on the aforesaid river, and was extravagantly fond of the classic game of "old sledge." He married, and in the course...
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