References
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No M1 Garand Library is complete without the following references.  To me, each of these books has been a tremendous aid in learning about the M1 rifle's history, design, and variations.
 

The M1 Garand: World War II, by Scott A. Duff
Scott Duff Publications (1993)

M1 Garand 1936 to 1957, by Joe Poyer and Craig Riesch
For Collectors Only Series, North Cape Publications (1997)

Hatcher's Book of the Garand, Maj. Gen. Julian S. Hatcher
reprint edition by The Gun Room Press (2000)

Basic Field Manual 23-5: U.S. Rifle, Caliber .30, M1
U.S. War Department (several versions available, mine is from 1943)

How to Shoot the U.S. Army Rifle
The Infantry Journal, Inc. (1943)

Complete Guide to the M1 Garand and the M1 Carbine, Bruce Canfield
Andrew Mowbray Inc. (1998)

The Gas Trap Garand, by Billy Pyle
Collector Grade Publications (1999)

Collecting the Garand II, by J.C. Harrison
The Arms Chest Publishers (1995)

While this website deals specifically with the World War II era M1 Garand, the following books are of general interest also:

The M1 Garand: Post World War II, by Scott A. Duff
Scott Duff Publications (1989)

The M1 Garand: Owner's Guide, by Scott A. Duff
Scott Duff Publications (1994)

The M1 Garand: Serial Numbers & Data Sheets, by Scott A. Duff
Scott Duff Publications (1995)