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The Library of Congress acquires materials in all formats--books, periodicals, maps, music, prints, photographs, recorded sound, videos, electronic, etc.--and in all subjects, except technical agriculture and clinical medicine, from all over the world. We use six methods to acquire materials--Cataloging in Publication, Copyright, Exchange, Gift, Federal Transfer, and Purchase. The collection is shaped by the Library's Collection Policy Statements and totals over 138,000,000 items.