Books on Sharpshooters

Berdan Sharpshooter History:

1. Marcot, Roy.  U.S. Sharpshooters:  Berdan's Civil War Elite
2. Stevens, C.A.  Berdan's United States Sharpshooters in the Army of the Potomac 1861-1865
3. Sword, Wiley.  Sharpshooter:  Hiram Berdan, His Famous Sharpshooters and Their Sharps Rifles.
4. Katcher, Phil.  Sharpshooters in the Civil War 1861-1865.