Ключевые слова: activist, african, aged, america, american, antique, author, burghardt, canceled, civil rights, collection, commemorative, correspondence, du bois, editor, edward, historian, hobby, isolated, issue, letter, macro, mail, male, man, office, old, paper, perforated, philately, post, postage, postal, postmark, retro, shipping, social, social activist, sociologist, stamp, states, united, united states, us, usa, used, vintage, w e b du bois, william,