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2. KH? M?U BIN M?C MARC21. KHI NI?M MARC (Machine-Readable Cataloging) MARC21 qu?n l thng tin thu m?c Cc lo?i ti liu: Sch ?n ph?m nhi?u k? T?p my tnh B?n d? Tc ph?m m nh?c Ti li?u nghe nhn Ti li?u h?n h?p. 3. KH? M?U BIN M?C
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