It's the 1989 reprint of the 1988 edition.
Don't know why they changed the cover.. I remember noticing at the time but I already had it in hardcover so thought nothing of it.

At work, when I had to reorder it, sometimes this cover would arrive, occasionally the earlier original one.
(At the time in the UK many publishers required whole book returns, not just the ripped off covers like in the US, so they could re-issue them to other shops as required. Hence the earlier cover showing up from time to time.)

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