Since I purchased all four volumes of this colossal work as they became available, am positively delighted that I did so, and herewith express enormous admiration for the authors' achievement, I think I've earned leave to make the following observation.
Advanced scholarship, stunning photography and magnificent printing ought not to be blighted by elementary mistakes in English punctuation and usage. They clash; it puts one's teeth on edge. Two consecutive sentences on the back cover of the dust jacket of Volume I are an unfortunate example: "The K98k rifle was Germanys principle battle rifle from 1935 until 1945. In those 10 years in K98k rifle left it's mark on the history of the world."
Any competent editor --even if he or she knew nothing about guns-- would have caught all three errors.
M