Completely by accident, I managed to end up with 2 copies of Mapping the Atari by Ian Chadwick, for the 8 bit Atari computers.
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It is widely regarded as one of the best books around in terms of it's usefulness, and is getting increasingly expensive, with originals going for upwards of £50 on eBay.
This is the earlier version that does not include the changes for the XL/XE lines, but is overall still very relevant. I did originally order the later version but it got 'lost in the post' and the seller ended up sending me the earlier version as they didn't have an exact replacement.
I'm selling one of mine (In the photo), the price is £35 inc P&P.
Please note that the copy for sale does contain notes made by one of it's owners (Not me), but they do not harm the book in any real way and the overall condition is excellent.