Statistics for occurrence #1 of “St. Louis, Missouri” in chapter 8 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...d taken energetic measures, as far as the funds appropriated would permit, to enlarge the principal arsenals, viz.: Watertown, Massachusetts; Watervliet, West Troy, New York; Allegheny, Pennsylvania; St. Louis, Missouri ; Washington, and Benicia, California. owing to the development of the resources of the United States, less material had been purchased abroad during the year ending June 30, 1863, than at previou...
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