Classification
620 - Engineering & allied operations
42
612 - Human physiology
38
551 - Geology, hydrology & meteorology
35
616 - Diseases
32
621 - Applied physics
31
572 - Biochemistry
27
541 - Physical chemistry
25
660 - Chemical engineering
22
577 - Ecology
20
006 - Special computer methods
19
547 - Organic chemistry
19
005 - Computer programming, programs & data
18
530 - Physics
18
519 - Probabilities & applied mathematics
16
571 - Physiology & related subjects
16
153 - Mental processes & intelligence
12
333 - Economics of land & energy
11
363 - Other social problems & services
11
548 - Crystallography
11
515 - Analysis
10
535 - Light & infrared & ultraviolet phenomena
10
539 - Modern physics
8
543 - Analytical chemistry
8
628 - Sanitary & municipal engineering
8
570 - Life sciences; biology
7
576 - Genetics & evolution
7
599 - Mammals
7
611 - Human anatomy, cytology & histology
7
658 - General management
7
671 - Metalworking & primary metal products
7
004 - Data processing & computer science
6
510 - Mathematics
6
574 - [Unassigned]
6
591 - Specific topics in natural history
6
595 - Arthropods
6
624 - Civil engineering
6
629 - Other branches of engineering
6
665 - Industrial oils, fats, waxes & gases
6
681 - Precision instruments & other devices
6
152 - Perception, movement, emotions & drives
5
518 - Numerical analysis
5
537 - Electricity & electronics
5
808 - Rhetoric & collections of literature
5
332 - Financial economics
4
364 - Criminology
4
523 - Specific celestial bodies & phenomena
4
573 - Specific physiological systems in animals
4
597 - Cold-blooded vertebrates; fishes
4
615 - Pharmacology & therapeutics
4
618 - Gynecology, obstetrics, pediatrics & geriatrics
4
more ...