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SDNB
000 Generalities, Science060 General organization & museology220 Bible380 Commerce, communications, transport430 Germanic490 Other languages550 Earth sciences580 Botanical sciences620 Engineering & allied operations621.3 Electrical Engineering, Electronics700 The arts770 Photography & photographs780 Music800 Literature & rhetoric940 General history of Europe970 General history of North America990 General history of other areasS School books