Ключевые слова: 1978, address, adult, airmail, album, ambush, animals, art, attack, background, blue, bodies, border, business, card, cetaceans, collection, communication, correspondence, dangerous, developed, echolocation, elephant, envelope, females, frame, history, hobby, hunt, icon, illustration, label, large, letter, mail, mailing, males, mammal, mark, message, national, orient, paper, perforated, perforation, philatelic, philately, pinniped, post, postage, postal, postcard, postmark, prefer, print, rectangle, rectangular, scrapbook, sea, seal, send, sensitive, service, set, sharks, sign, species, stamp, states, sticker, successful, symbol, themselves, tourism, used, ussr, vibrations, water, weakening, whales,