Statistics for occurrence #1 of “Missouri River” in entry united-states-of-america-missouri of Harper's Encyclopedia of United States History:

... Missouri River
One of the central United States, lies west of the Mississippi River, which separates it from Illinois, Kentucky, and Tennessee...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Missouri River (Kansas, United States) 30 12 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.