Ключевые слова: arnold, austria, austrian, card, collection, collector, communication, composer, conductor, connection, correspondence, date, delivery, dodecaphony, educator, expressionism, franz, history, hobby, image, letter, mail, mark, musicologist, philatelist, philately, postage, postage stamp, postcard, postman, relationship, retro, schoenberg, schonberg, stamp, twelvetone technique, vintage, walter, zigzag,