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SDNB
000 Generalities, Science390 Customs, etiquette, folklore430 Germanic450 Italian, Romanian, Rhaeto-Romanic500 Natural sciences530 Physics540 Chemistry & allied sciences580 Botanical sciences610 Medical sciences Medicine621.3 Electrical Engineering, Electronics710 Civic & landscape art790 Recreational & performing arts791 Public performances793 Indoor games & amusements796 Athletic & outdoor sports & games