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Scarce map of the Mississippi River and Mississippi Valley basin, illustrating the Alluvial Land regions onf the river and its major tributaries. From Humphreys & Abbot's Report Upon The Physics And Hydraulics of the Mississippi River Upon the Protection of the Alluvial Region Against Overflow and Upon the Deepening of the Mouths, published in 1861. Marvelous detail. No copy has been recorded in a dealer catalogue in over 20 years.