Statistics for occurrence #1 of “Clark's Fork” in entry nez-perce-indians of Harper's Encyclopedia of United States History:

...lake; then they crossed the Snowy Mountains, and moved down Clark's Fork, with General Howard on a hot trail. On Sept. 13 General Sturgis had a fight with them on the Yellowstone below the mouth of Clark's Fork , capturing hundreds of horses and killing a number of the Indians. Then the Indians crossed the Yellowstone, passed north through the Judith Mountains, and reached the Missouri River near Cow Islan...
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