Ключевые слова: aged, antique, canceled, commemorative, communication, correspondence, danylo, danylo kyrylovych zabolotny, epidemiologist, europe, hobby, isolated, issue, kyrylovych, letter, macro, mail, male, man, microbiologist, office, old, paper, perforated, philately, post, postage, postal, postmark, retro, russia, russian, service, shipping, stamp, ukrainian, used, vintage, zabolotny,