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Quite variable in quality but they all have the advantage of not taking long. I used to work at a charity with a dozen regional offices, each of which I had to visit at least once a year for tech support, and I would often take the latest (or an old one) on the train with me, knowing I had a decent chance - at the more remote offices - of reading half of it on the way out and the other half on the way back.
Anything from Terry Pratchett