Ключевые слова: aged, antique, bacillus, canceled, collection, communication, correspondence, culture, discoverer, discovery, german, germany, hobby, isolated, issue, koch, letter, macro, mail, male, man, medicine, office, old, paper, people, perforated, philately, post, postage, postal, postmark, retro, robert, scientist, shipping, stamp, tubercle, used, vintage,