Statistics for occurrence #1 of “Ohio” in entry cannon of Harper's Encyclopedia of United States History:

...guns and forcibly expanding the bore to its finished size by means of mandrels, 1869. Pneumatic dynamite torpedo-gun built and mounted at Fort Lafayette (founded on invention of D. M. Mefford, of Ohio ), 1885. Congress makes an appropriation for the establishment of a plant for gunmaking at the Watervliet arsenal, West Troy, 1889. Manufacture of heavy ordnance begun at the Washington navy-...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Ohio (Ohio, United States) 4,328 891 10 1 0 user votes
Ohio (United States) 1,611 200 1 0 0 user votes
Ohio (Colorado, United States) 12 0 0 0 0 user votes
Ohio (Illinois, United States) 0 0 0 0 0 user votes
Ohio (Missouri, United States) 0 0 0 0 0 user votes
Ohio (New York, United States) 0 0 0 0 0 user votes
Ohio (Texas, 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.