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Re:Why We Need Difficult Books by Cthulhu_ on Wednesday November 14, 2018 @04:03AM (#18448526)
I would've thought they request they're not older than a year; libraries and secondhand book shops / charities often have a shelf of e.g. Office 2003 for dummies lying around still.

Some books are timeless though; Tanenbaum, Knuth, etc.

Re:Why We Need Difficult Books by LarryMade2 on Wednesday November 14, 2018 @11:08AM (#18450901)
Yeah not older than a year was another part of that - which also takes off a lot of great books. I have some references from 1990s and early 2000s that are way more thorough than the later stuff produced.