MadFarmers:  Like yourself, I own Mallory's, Bropy's, and Poyer's books.  I enjoy all three (along with ordnance manuals and KCA Forum contributions).  I find that they complement each other.  IMHO, Poyer's Book supplies lots of useful photographs and parts details.  It helps me more fully enjoy the evolution, construction and functioning of the U.S. Krag.  I don't believe there is any one perfect source of information.  I have been a student of firearms and shooting for 57 years.  I still learn something new every day.  For an Arms Enthusiast without a Krag Library, the Poyer Book has a lot of useful information, is inexpensive, readily available and quite portable.  I would encourage any arms collector to build their library, build their knowledge base, and have a healthy skepticism and curiosity.