 the udc intern aspect univers decim classif - dy duck live bird? - titl - suggest highli debat time duck-shooter develop concert onslaught half-hour allow discuss besid hope convinc - bsi's fine effort - udc dy duck - dead duck - severest critic imagin perhap bird ceas soar time otlet la fontain bradford donker duyvi viabl turbul air current document gaug fid inquiri aim obtain figur distribut udc edit approxim estim number user 