Poyer's book is not highly thought of because it has a number of errors. It is OK for general info, but I would not depend on any details. Canfield is good. There is also a book by Jesse Harrison that has some good info, but also has so many errors that it really cannot be depended on. (As one glaring example of an error, Harrison shows {line drawings} rifles marked "Rock Island Armory", when the actual marking is "Rock Island Arsenal".)
Jim
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