Classification
616 - Diseases
5,552
006 - Special computer methods
2,347
005 - Computer programming, programs & data
2,262
621 - Applied physics
2,149
530 - Physics
2,088
620 - Engineering & allied operations
2,001
571 - Physiology & related subjects
1,811
515 - Analysis
1,697
519 - Probabilities & applied mathematics
1,678
300 - Social sciences
1,557
001 - Knowledge
1,426
004 - Data processing & computer science
1,240
572 - Biochemistry
1,233
617 - Surgery & related medical specialties
1,154
551 - Geology, hydrology & meteorology
1,069
541 - Physical chemistry
1,040
610 - Medicine & health
1,035
512 - Algebra
1,028
577 - Ecology
1,010
320 - Political science
993
612 - Human physiology
964
330 - Economics
904
520 - Astronomy & allied sciences
879
615 - Pharmacology & therapeutics
796
658 - General management
706
510 - Mathematics
696
539 - Modern physics
694
003 - Systems
684
333 - Economics of land & energy
665
580 - Plants (Botany)
565
516 - Geometry
544
629 - Other branches of engineering
520
547 - Organic chemistry
505
500 - Natural sciences & mathematics
503
501 - Philosophy & theory
503
660 - Chemical engineering
485
338 - Production
478
511 - General principles of mathematics
471
531 - Classical mechanics; solid mechanics
471
150 - Psychology
456
618 - Gynecology, obstetrics, pediatrics & geriatrics
427
900 - History & geography
383
613 - Personal health & safety
376
518 - Numerical analysis
370
523 - Specific celestial bodies & phenomena
370
570 - Life sciences; biology
359
301 - Sociology & anthropology
353
327 - International relations
349
514 - Topology
328
614 - Incidence & prevention of disease
320
more ...