Ninety per cent of the Soviet Union in fact is closed to visitors. much of what is revealed may not be especially attractive to a U.S. citizen. but. on the other hand. seem utopian to a native of a misgoverned. exploited. Impoverished or undeveloped country. When our piane from Vienna landed about 300 of us entered the Moscow. Customs Building. About onethird were promptly processed as Holding Soviet passports or as a part of a preprocessed group. The rest of us eventually found a customs declaration in a language we could understand and formed a long queue. Officials compared us to the photographs on our visas. Magazines and printed matter. including sales brochures carried by businessmen. were inspected with particularity. Magazines even faintly resembling Playboy were confiscated on the spot as pornographic.