So, I was gifted a "Hand Book for Infantry" dated 1813. The person I got it from doesn't know the history behind it, but thinks it's authentic. It absolutely looks extremely old and may very well be legit (or maybe too good to be true). How would I go about getting this verified?
https://i.postimg.cc/h42dbHmC/INF-Regs2a.jpg
https://i.postimg.cc/NfLrNp7Q/INF-Regs1a.jpg