Two hundred and nineteen years ago this week (July 17-23), the Corps of Discovery was traveling up the Missouri River toward its intended winter camp in the Mandan nation in what is now North Dakota. On the 17th, Clark wrote: “We concluded to lay by today to fix the longitude and latitude of this place and to fix the chronometer (she ran down the day before yesterday).” This layover location was near the present town of Peru, Nebraska. Over the next five days, the Corps covered approximately seventy-six river miles, camping the night of the 22nd about ten miles above...

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