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Originally Posted by Jan Bobek
would you please describe me the procedure how to pucharse ULTRA microfilms?
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I think that the UK National Archives website will explain the ordering system.
If it wasn't clear from the other posts, the file series with the "Main series of reports to Allied Commands" is DEFE3. (This is the series that I have spent most time with).
Details of each file are on the NA website.
Someone mentioned that the messages are in date order but that is the date the decrypted report was issued. This could be some days after the original message was sent, so if you are interested in a particular event, you may need files for a few days later to see if there is a decrypt.
Files contain 250 signals each (usually the traffic from about 3 days) and there can be from one to four files on a single reel of microfilm.