I bought Canfield's book and it's all I'll ever need as a Garand resource. One and done.
That's how I feel. Its 872 pages and is the most up to date and authoritative book on the M1 in general. To my knowledge, its also the only book on the M1 Garand with hundreds of color
photograph/pictures, which really adds to a quality product.
Its not inexpensive, but it is The Reference book on the history of this historical rifle. Very few books qualify as a true magnum opus
, but IMO, Bruce Canfield's book on the M1 Garand meets that criteria hands-down.