Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: The Library of Congress Control Number (LCCN) bụ usoro nke usoro nke usoro nchịkọta nke ndekọ ndekọ na Library of Congress na United States. O nweghi ihe jikọrọ ya na ihe dị n'akwụkwọ ọ bụla, na ekwesighi ịghọtahie ya na Library of Congress Classification.  Ajụjụ: Gịnị ka LCCN pụtara?
Nọmba Nchịkwa Ọbá Akwụkwọ nke Congress