Statistics for occurrence #1 of “Columbia River” in entry indians-american of Harper's Encyclopedia of United States History:

...rom the Rocky Mountains to the Pacific Ocean, in Oregon and Washington. Beyond these are the more powerful Chinooks, now rapidly melting away. They embraced numerous tribes, from the mouth of the Columbia River to the Grand Dalles. The Shoshones comprise tribes inhabiting the territory around the headwaters of the Columbia and Missouri rivers; the Comanches, extending from the head-waters of the Brazo...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Columbia River (United States) 178 84 0 0 0 user votes
Columbia River (Washington, United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.