Ключевые слова: address, adult, aged, ancient, antique, approval, bacillus, canceled, cancelled, card, collection, collector, communication, connection, correspondence, date, delivery, envelope, face, german, global, head, heinrich, hermann, historic, history, hobby, image, intelligent, koch, laureate, letter, mail, male, man, mark, medicine, message, microbiology, nobel, nobelprize, office, old, paper, payment, people, perforated, perforation, person, philatelist, philately, physician, physiology, picture, portrait, post, postage, postal, postcard, postman, postmark, price, print, prize, relationship, retro, robert, romania, rumania, science, scientist, seal, serious, stamp, tuberculosis, unique, used, vintage, zigzag,