The Science of Discworld I-III by Terry Pratchett, Ian Stewart and Jack Cohen
05/12/2009 01:50:26 PM
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I just realised that I didn't get back to you about this. Sorry.
05/12/2009 02:40:51 PM
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These are all brilliant, especially #2 *NM*
07/12/2009 01:56:56 PM
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