Without hijacking the thread, Ken's books are some of the best out there. He used tons of firsthand information. Some of his research is dated, especially in the late-war aspects of the usage of RLM 80 and 81 in conjunction with 74 and 75, but that's the way it works. You publish a book and then discover a whole bunch of new stuff afterwards.
These books are definite must-have books for anyone skinning, modeling, or interested in the wild world of Luftwaffe camo.
...and $50 for the pair is a STEAL.
J (who has 2 sets, one set signed!)