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SDNB
030 General encyclopedic works150 Psychology230 Christian theology330 Economics370 Education380 Commerce, communications, transport420 English520 Astronomy & allied sciences580 Botanical sciences620 Engineering & allied operations621.3 Electrical Engineering, Electronics624 Structural and Environmental Engineering660 Chemical engineering770 Photography & photographs780 Music790 Recreational & performing arts792 Stage presentations810 American literature in English830 Literatures of Germanic languages839 Other Germanic literatures860 Spanish & Portuguese literatures880 Hellenic literatures Classical Greek943 General history of Europe Central Europe Germany950 General history of Asia Far East960 General history of Africa980 General history of South America