WHEN DOES A bookseller become a dealer? Both need to be able, at a glance, to spot an underpriced book amidst a shelf of dross. Rick Gekoslu provides the good example of visiting Graham Greene’s Paris flat and noticing a copy of his littleknown work A& Two Years. This was one of two volumes of poetry published in minuscule editions by the Rosaio Press – named her the Anacapri villa where Greene lived with hls mistress Catherine Walston. It was so obscure that Greene’s bibliographer missed it. No copies were sent out; Greene kept numbers one and two – his own and Lady Walston’s.