blywi

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XOR A absolutely works on Z80 and it's of course faster and shorter than loading a zero value with LD A,0. LD A,0 is encoded to 2 bytes while XOR A is encoded as a single opcode. XOR A has the additional benefit to also clear all the flags to 0. Sub A will clear the accumulator, but it will always set the N flag on Z80.

blywi

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I think the answer is in the article text "all meticulously sectioned by publisher". Book sizes differ somewhat between publishers, but each publisher tends to only print books in a few standard sizes. For the paperback editions this is even more reduced, it usually looks to me like all paperbacks from one publisher are the same size.