616 - Diseases 3,241 612 - Human physiology 2,775 614 - Incidence & prevention of disease 2,092 613 - Personal health & safety 2,023 615 - Pharmacology & therapeutics 1,254 610 - Medicine & health 722 617 - Surgery & related medical specialties 716 362 - Social welfare problems & services 606 301 - Sociology & anthropology 510 618 - Gynecology, obstetrics, pediatrics & geriatrics 438 155 - Differential & developmental psychology 409 796 - Athletic & outdoor sports & games 331 574 - [Unassigned] 313 152 - Perception, movement, emotions & drives 294 611 - Human anatomy, cytology & histology 286 628 - Sanitary & municipal engineering 285 591 - Specific topics in natural history 281 157 - [Unassigned] 257 363 - Other social problems & services 239 620 - Engineering & allied operations 167 509 - Historical, geographic & persons treatment 141 660 - Chemical engineering 138 629 - Other branches of engineering 120 658 - General management 102 338 - Production 100 333 - Economics of land & energy 99 371 - Schools & their activities; special education 95 344 - Labor, social, education & cultural law 92 547 - Organic chemistry 90 158 - Applied psychology 87 551 - Geology, hydrology & meteorology 86 153 - Mental processes & intelligence 85 573 - Specific physiological systems in animals 85 361 - Social problems & social welfare in general 78 364 - Criminology 68 150 - Psychology 67 621 - Applied physics 65 375 - Curricula 64 331 - Labor economics 51 711 - Area planning 47 599 - Mammals 45 354 - Administration of economy & environment 43 664 - Food technology 43 154 - Subconscious & altered states 42 174 - Occupational ethics 38 372 - Elementary education 37 330 - Economics 36 641 - Food & drink 36 312 - [Unassigned] 35 519 - Probabilities & applied mathematics 34 668 - Technology of other organic products 33 001 - Knowledge 31 309 - [Unassigned] 30 589 - [Unassigned] 30 797 - Aquatic & air sports 30 576 - Genetics & evolution 28 370 - Education 26 661 - Industrial chemicals 26 394 - General customs 25 388 - Transportation; ground transportation 24 595 - Arthropods 24 352 - General considerations of public administration 22 725 - Public structures 22 179 - Other ethical norms 21 575 - Specific parts of & systems in plants 21 016 - Bibliographies of works on specific subjects 20 541 - Physical chemistry 20 793 - Indoor games & amusements 20 006 - Special computer methods 19 339 - Macroeconomics & related topics 19 627 - Hydraulic engineering 19 790 - Recreational & performing arts 19 341 - Law of nations 18 401 - Philosophy & theory 17 631 - Techniques, equipment & materials 17 544 - [Unassigned] 16 581 - Specific topics in natural history 16 619 - [Unassigned] 16 693 - Specific materials & purposes 16 380 - Commerce, communications & transportation 15 535 - Light & infrared & ultraviolet phenomena 15 649 - Child rearing & home care of persons 15 697 - Heating, ventilating & air-conditioning 15 350 - Public administration & military science 14 387 - Water, air & space transportation 14 534 - Sound & related vibrations 13 546 - Inorganic chemistry 13 572 - Biochemistry 13 636 - Animal husbandry 13 176 - Ethics of sex & reproduction 12 353 - Specific fields of public administration 12 355 - Military science 12 942 - England & Wales 12 632 - Plant injuries, diseases & pests 11 543 - Analytical chemistry 10 596 - Chordates 10 156 - Comparative psychology 9 300 - Social sciences 9 378 - Higher education 9 414 - Phonology & phonetics 9