Thanks, stardrifter. I did a bit of a look as well and saw the abebooks link...one thing I did note was that the copies on Amazon and Abebooks seem to be 1982 copies. Both of mine ( and I can't for the life of me remember how I came to have two) are 1980 copies and may therefore be 1st editions. I'm awfully tempted to sell them, but if they are valuable they won't be getting cheaper over time, so I might hang on 5 years and see what happens....
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