Statistics for occurrence #1 of “Boston Mountains” in chapter 14 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...ptember 29, 1862. Occupation of Newtonia October 4. March to Old Fort Wayne, arriving October 29. Cane Hill November 28. Battle of Prairie Grove, Ark., December 7. Expedition over Boston Mountains to Van Buren, Ark., Dec. 27-31. Capture of Van Buren December 29. March to Springfield, Mo., January 7, 1863, and duty there till May. March to Fort Scott, Kan., May 19-29, thence to Dryw...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Boston Mountains (Arkansas, United States) 140 91 2 1 0 user votes
Boston Mountains (Arkansas, United States) 8 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.