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SDNB
000 Generalities, Science070 News media, journalismn, publishing330 Economics350 Public administration360 Social services, association420 English480 Hellenic languages Classical Greek500 Natural sciences620 Engineering & allied operations670 Manufacturing720 Architecture740 Drawing & decorative arts793 Indoor games & amusements800 Literature & rhetoric810 American literature in English850 Italian, Romanian, Rhaeto-Romanic literatures860 Spanish & Portuguese literatures890 Literatures of other languages990 General history of other areas