I know what you mean. The Poyer book is not infallible; but, for a mere $20 it will take a person off the street who knows nothing about Krags and give him a "high school diploma".

If you want an "MS" in Krags, get Mallory and Brophy. That will cost you $150 to $200 more. The info is slightly more accurate (let's say there are fewer egregious and/or careless errors) but the pictures are much better. Brophy had a much larger production budget than Mallory, so you need his photographs to see what Mallory was talking about.

A Krag PhD will require the book(s) that are yet to be written. They will provide a great deal of well-deserved personal satisfaction to the author, but, unless reasonably priced, will probably not see wide circulation. Which, if I understand him only a teensy bit, will not bother said author in the least!  :-)

Just my $.02 worth.