Badlands Tactical Training Facility
408 North Simpson
Grandfield, OK 73546
The Ultimate Sniper: An advanced Training Manual for Military and Police Snipers Maj. John L. Plaster, USAR (ret.)
U.S. Army Sniper Training Manual TC 23-10
Understanding Firearm Ballistics, Robert Rinker
How do bullets fly? written by Ruprecht Nennstiel.
Many fellow shooters and a few real snipers.