The book you mentioned is "The Land That Is Pulaski County" by Conway Howard Smith. Jacob Henry Trolinger, his sons Henry and John did manufacture gun powder using the salt petre mined in the cave, and mixed it wit the appropriate amounts of sulfer, and chaecoal. It was sold not only to the Virginia Militia during the Revolutionary War, but traded at the local store for about 25¢ a pound. John's gandson, Lt. James T. Trolinger, CSA, also mined the salt petre and made gunpowder during theCivil War.
This book can be purchased at the Public Library in Dublin.