Old with dated references but very valuable - the science and craftsmanship of shooting.
Open Source Documents and Movies Links on Rifle Marksmanship Training
WWII Rifle Marksmanship Part 1
WWII Rifle Marksmanship Part 2
Fundamentals of Rifle Marksmanship (1964)
USMC Fundamentals of Rifle Marksmanship (1999)
Pistol Marksmanship Training Guide
Big Picture: Commence Firing, American Marksmanship
Cold war propaganda at its best!