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SDNB
000 Generalities, Science030 General encyclopedic works060 General organization & museology070 News media, journalismn, publishing310 General statistics490 Other languages540 Chemistry & allied sciences620 Engineering & allied operations640 Home economics & family living650 Management & auxialiary services770 Photography & photographs780 Music830 Literatures of Germanic languages860 Spanish & Portuguese literatures890 Literatures of other languages970 General history of North America990 General history of other areas