650 - Management and auxiliary services 65,030 查看记录 630 - Agriculture and related technologies 46,745 查看记录 610 - Medicine and health 27,487 查看记录 620 - Engineering and allied operations 26,096 查看记录 660 - Chemical engineering 10,136 查看记录 640 - Home and family management 3,437 查看记录 670 - Manufacturing 2,929 查看记录 680 - Manufacture of products for specific uses 1,313 查看记录 600 - Technology (Applied sciences) 750 查看记录 690 - Construction of buildings 558 查看记录 330 - Economics 5 查看记录 570 - Biology 5 查看记录 000 - Computer science, information, general works 3 查看记录 070 - Documentary, educational, news media; journalism 2 查看记录 150 - Psychology 2 查看记录 530 - Physics 2 查看记录 020 - Library and information sciences 1 查看记录 050 - General serial publications 1 查看记录 340 - Law 1 查看记录 380 - Commerce, communications, transportation 1 查看记录 500 - Natural sciences and mathematics 1 查看记录 510 - Mathematics 1 查看记录 550 - Earth sciences 1 查看记录 580 - Plants 1 查看记录 770 - Photography, computer art, cinematography 1 查看记录