Romani,
they are getting a little dated by now having been published in the 60's, at least, that's when I think they were published!
the one I've picked up is 12 pages of A5 including the covers. theres a grey scale side view on the front, 2 colour profiles on the inside cover, eight pages of text, six large and 2 small colour profiles on the inside of the back cover, and a detailed specification on the very back.
I think they are a bit like the Ken Munson query, good basic references that have occasionally been overtaken by further research.
The one I picked up to answer this is by the late Jack Bruce and there isn't much wrong with his work.
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How do they rate compared with Squadron Signal publications?
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Different league IMO.
Mike