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609 - History, geographic treatment, biography 322 607 - Education, research, related topics 319 602 - Miscellany 170 608 - Patents 144 604 - Technical drawing, hazardous materials 131 601 - Philosophy and theory 118 600 - Technology (Applied sciences) 99 606 - Organizations 47 605 - Serial publications 37 621 - Applied physics 25 603 - Dictionaries, encyclopedias, concordances 23 001 - Knowledge 15 005 - Computer programming, programs, data, security 11 620 - Engineering and allied operations 7 500 - Natural sciences and mathematics 5 301 - Sociology and anthropology 4 353 - Specific fields of public administration 4 541 - Physical chemistry 4 658 - General management 4 363 - Other social problems and services 3 389 - Metrology and standardization 3 509 - History, geographic treatment, biography 3 535 - Light and related radiation 3 539 - Modern physics 3 547 - Organic chemistry 3 629 - Other branches of engineering 3 324 - The political process 2 331 - Labor economics 2 338 - Production 2 343 - Military, tax, trade & industrial law 2 501 - Philosophy and theory 2 536 - Heat 2 624 - Civil engineering 2 670 - Manufacturing 2 681 - Precision instruments and other devices 2 693 - Specific materials & purposes 2 025 - Operations of libraries and archives 1 068 - General organizations in other geographic areas 1 070 - Documentary, educational, news media; journalism 1 303 - Social processes 1 305 - Groups of people 1 330 - Economics 1 347 - Procedure and courts 1 364 - Criminology 1 370 - Education 1 380 - Commerce, communications, transportation 1 502 - Miscellany 1 507 - Education, research, related topics 1 519 - Probabilities and applied mathematics 1 530 - Physics 1 537 - Electricity and electronics 1 543 - Analytical chemistry 1 546 - Inorganic chemistry 1 551 - Geology, hydrology, meteorology 1 610 - Medicine and health 1 615 - Pharmacology and therapeutics 1 617 - Surgery & related medical specialties 1 622 - Mining and related operations 1 628 - Sanitary engineering 1 651 - Office services 1 657 - Accounting 1 660 - Chemical engineering 1 669 - Metallurgy 1 685 - Leather, fur goods & related products 1 686 - Printing and related activities 1 690 - Construction of buildings 1 697 - Heating, ventilating & air-conditioning 1 725 - Public structures 1 920 - Biography, genealogy, insignia 1 930 - History of ancient world to ca. 499 1 944 - France and Monaco 1 977 - North central United States 1