Classification
620 - Engineering & allied operations
52
530 - Physics
34
700 - The arts; fine & decorative arts
15
616 - Diseases
14
541 - Physical chemistry
13
600 - Technology
13
610 - Medicine & health
13
539 - Modern physics
12
900 - History & geography
10
621 - Applied physics
9
330 - Economics
8
333 - Economics of land & energy
8
363 - Other social problems & services
6
540 - Chemistry & allied sciences
6
543 - Analytical chemistry
6
548 - Crystallography
6
001 - Knowledge
5
300 - Social sciences
5
332 - Financial economics
5
500 - Natural sciences & mathematics
5
546 - Inorganic chemistry
5
660 - Chemical engineering
5
000 - Computer science, information & general works
4
576 - Genetics & evolution
4
547 - Organic chemistry
3
571 - Physiology & related subjects
3
572 - Biochemistry
2
631 - Techniques, equipment & materials
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
006 - Special computer methods
1
140 - Specific philosophical schools
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
519 - Probabilities & applied mathematics
1
520 - Astronomy & allied sciences
1
536 - Heat
1
537 - Electricity & electronics
1
542 - Techniques, equipment & materials
1
549 - Mineralogy
1
574 - [Unassigned]
1
579 - Microorganisms, fungi & algae
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1
624 - Civil engineering
1
628 - Sanitary & municipal engineering
1
630 - Agriculture & related technologies
1
658 - General management
1