Statistics for occurrence #1 of “Col. I. M. St. John” in chapter 1.1 of Southern Historical Society Papers, Volume 37.:

...h was made for nitre earth, and considerable quantities were obtained from caves in Tennessee, Georgia and North Alabama, as also from old buildings, cellars, plantation quarters and tobacco barns. Col. I. M. St. John was, in 1862, given separate charge of this work, and developed it systematically on a large scale. He also established artificial nitre beds at Columbia and Charleston, S. C., Augusta and Savannah...
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