I had a copy of Paul Hellweg's book Flintnapping, the Art of Making Stone Tools. But I'm going to hit these sites also.
I have a couple friends who flit nap up in Michigan and I've watched them make some really nice arrowheads and spear tips.
I just keep thinking about opening up my hand on a sharp stone.
Thanks! Somewhere, I have a book I got from the Stovall Museum (the Sam Noble Oklahoma Museum of Natural History, now that they've gotten all uppity) back in the early '80s on making flint knives and arrowheads; one of these days, I'll have to figure out where I have it stashed...