Statistics for occurrence #1 of “northwest Arkansas” in chapter 13 of Wiley Britton, Memoirs of the Rebellion on the Border 1863.:

...works near here have made this locality one of considerable importance for many years. Before the war large quantities of salt were taken from this place to various points in southwest Missouri and northwest Arkansas , and sold or exchanged for goods which the Indians required. We passed several of the salt wells this morning, and they were flowing like fountains, the column of salt water in one instance extendi...
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