They’re all persons, places, or things found in the index to David Kokernot: Rogue Soldier of the Texas Revolution. So, too, are “grand larceny,” “O6,” and “Old Igo” among the 1007 entries in the index.
Indexing is surprisingly difficult. The indexer must place himself in the mind of the reader to imagine the information he would seek and the terms he would use to find it. The author is probably the least able to do this, especially if he has worked a decade writing the book. I tried it, quickly gave up, and hired a professional indexer, Melody Englund, to do it. Take a look. I’m sure you will agree she did an excellent job.