Ed,
thanks... the 7-8 paragraphs I put together there were primarily based on a quick read through of the chapter devoted to I./JG 51 and picking out a few interesting things. Otherwise I don't really know what to say, other than get a copy while/if you can, but then its a little late in the day to be saying that. The amount of text/data in a volume like this (these) is frankly mind-boggling. I don't know how the authors do it or even how they manage to organise themselves, let alone the material...FWIW partial answer
here though