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SDNB
000 Generalities, Science060 General organization & museology070 News media, journalismn, publishing150 Psychology320 Political science333.7 Natural resources, energy and environment335 Military science390 Customs, etiquette, folklore430 Germanic439 Other Germanic languages460 Spanish & Portugese languages490 Other languages500 Natural sciences600 Technology (Applied sciences)621.3 Electrical Engineering, Electronics624 Structural and Environmental Engineering630 Agriculture690 Buildings770 Photography & photographs860 Spanish & Portuguese literatures910 Geography & travel930 History of the ancient world940 General history of Europe