Statistics for occurrence #1 of “Arkansas River” in entry florida of Harper's Encyclopedia of United States History:

...erican side. It was agreed that the Sabine to lat. 33° N., thence a north meridian line to the Red River, the course of that river to long. 100° W., thence north by that meridian to the Arkansas River to its head and to lat. 42° N., and along that degree to the Pacific Ocean, should be the boundary between the possessions of the United States and Spain. The Florida treaty was immediately rat...
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