Classification
620 - Engineering & allied operations
33
612 - Human physiology
31
551 - Geology, hydrology & meteorology
26
616 - Diseases
25
621 - Applied physics
20
541 - Physical chemistry
18
572 - Biochemistry
18
547 - Organic chemistry
15
006 - Special computer methods
14
005 - Computer programming, programs & data
13
571 - Physiology & related subjects
13
577 - Ecology
13
530 - Physics
12
519 - Probabilities & applied mathematics
11
660 - Chemical engineering
10
363 - Other social problems & services
8
535 - Light & infrared & ultraviolet phenomena
8
548 - Crystallography
8
153 - Mental processes & intelligence
7
333 - Economics of land & energy
7
628 - Sanitary & municipal engineering
7
004 - Data processing & computer science
6
543 - Analytical chemistry
6
570 - Life sciences; biology
6
576 - Genetics & evolution
6
611 - Human anatomy, cytology & histology
6
510 - Mathematics
5
539 - Modern physics
5
595 - Arthropods
5
599 - Mammals
5
658 - General management
5
671 - Metalworking & primary metal products
5
515 - Analysis
4
523 - Specific celestial bodies & phenomena
4
574 - [Unassigned]
4
591 - Specific topics in natural history
4
665 - Industrial oils, fats, waxes & gases
4
681 - Precision instruments & other devices
4
025 - Library operations
3
150 - Psychology
3
152 - Perception, movement, emotions & drives
3
332 - Financial economics
3
338 - Production
3
364 - Criminology
3
552 - Petrology
3
610 - Medicine & health
3
618 - Gynecology, obstetrics, pediatrics & geriatrics
3
624 - Civil engineering
3
662 - Explosives, fuels & related products
3
669 - Metallurgy
3
more ...