Using Ultra to research the Luftwaffe

Dear friends,
As these posts show, the value of the ULTRA intercepts for studying the Luftwaffe history is indisputable.
While the best source are the original messages, the material included in the DEFE 3 files is enormous, and it is freely accessible from every part of the word, and downloadable to your PC for your personal research.
One of the problems with these files is that there is no system to how the files are catalogued which makes researching a particular period rather cumbersome.
To overcome this problem, I have prepared a guide that I think could be useful to some other researchers.
I post it here, hoping that younger researchers with more time could use it, to bring benefit to everybody.
In the meanwhile if you had crash reports, prisoner interrogations and similar material on the III./ZG 26 during its Mediterranean stay, I could find some use for them…
Regards
Daniele