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.)
Understanding Firearm Ballistics, Robert Rinker
How do bullets fly? written by Ruprecht Nennstiel.
Many fellow shooters and a few real snipers.