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SDNB
000 Generalities, Science060 General organization & museology333.7 Natural resources, energy and environment500 Natural sciences560 Paleontology Paleozoology600 Technology (Applied sciences)621.3 Electrical Engineering, Electronics624 Structural and Environmental Engineering650 Management & auxialiary services740 Drawing & decorative arts760 Graphic arts Printmaking & prints790 Recreational & performing arts840 Literature of Romance languages850 Italian, Romanian, Rhaeto-Romanic literatures880 Hellenic literatures Classical Greek900 History940 General history of Europe950 General history of Asia Far East970 General history of North America