Appellant, who operated a stationery store and luncheonette, was convicted of selling "girlie" magazines to a 16-year-old boy in violation of § 484-h of the New York Penal Law, which made it unlawful "knowingly to sell . . . to a minor" under 17 "(a) any picture . . . which depicts nudity . . . and which is harmful to minors," and "(b) any . . . magazine . . . which contains [such pictures] and which, taken as a whole, is harmful to minors."