Recently the book "Flugmotoren and Strahltriebwerke" was mentioned, this is indeed a very good book.
There is another one:
"Luftfahrtforschung in Deutschland"
(aviation research in germany)
Like the engine book it covers the history from the beginnings until today.
I already had a view inside it, and it looks good. It also has a part of the engine book inside.
It s thick and expensive, but i found this page where you can get it cheaper:
http://www.ifb.uni-stuttgart.de/~doerner/Buch-Neuerscheinung.htmlMaybe i can get the book over my university cheaper too, because Prof. Madelung, one of the authors, is still active here and holds some courses. He is the nephew of Willi Messerschmitt btw. I try to find it out whether a collect order over him is possible.
niklas