(Associated Press) From sunken steamboats to a millennium-old map engraved in rock, the drought-drained rivers of the nation’s midsection are offering a rare and fleeting glimpse into years gone by.

Lack of rain has left many rivers at low levels unseen for decades, creating problems for river commerce and recreation and raising concerns about water supplies and hydropower if the drought persists into next year, as many fear.

But for the curious, the receding water is offering an occasional treasure trove of history.

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