99p large format paperback, red band to cover (A cura del Gruppo Matematica), author inscription, ...
169p red period paperback, first Penguin printing, plates, some accidental dog-earing
127p purple paperback, cover slightly grubby, creases on spine, binding slightly loose in centre, ...
64p small format with red and orange helvetica lettering sideways, neat booklet, ink notes in back
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