Tim, I have a Overstreet artifact guide that I use for reference. It shows several pictures of each point type and gives little ID tips about them. It comes in very handy. I didn't actually look at mine till after I had made this one. I just went by what the book showed. In fairness, I have studied several authentic Lost Lakes before, so I already knew exactly what they look like.
You should look into getting one of those books. Besides good info for the knapper, they're very intersting to study. I bet I've looked through mine a thousand times.