Yes, it's in German, but...
Just to add to what Paul said about Rolff's book...
One of the book's best features, I've found, is the collection of contemporary photographs, many from the Imperial War Museum, depicting servicemen of various eras, equipped with some rather interesting weapons. Found there are grandfathers in the Royal West Surrey Regiment armed with Martini Enfield Carbines sporting Pattern 1888 bayonets, Sherwood Foresters with Arisakas, and, what is probably the best reproduction, in a beautifully clear, two-page format, of the often-printed photo of the New Zealand sniper in the rubble of Monte Cassino, sighting through the scope of a No. 4 (T) ex-Trials rifle.
These photos alone are worth the price of admission.
Merry Christmas everyone!
Terry