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#1: Structurally very sound: flat, tight. Quite a bit of overall/general wear from storage/handling, most notably spine stress. Still, a nice solid example for your collection.
#6: nice copy; minimal wear
#7: nice copy; a little more worn
#12: creasing on the corners
#19 (1): some staining/foxing
#19 (2): nice copy; very minimal wear
#21: tape pull and rip on front cover