Classification
541 - Physical chemistry
28
540 - Chemistry & allied sciences
23
547 - Organic chemistry
20
530 - Physics
16
620 - Engineering & allied operations
16
660 - Chemical engineering
7
551 - Geology, hydrology & meteorology
6
600 - Technology
6
700 - The arts; fine & decorative arts
6
333 - Economics of land & energy
5
621 - Applied physics
5
668 - Technology of other organic products
4
546 - Inorganic chemistry
3
610 - Medicine & health
3
612 - Human physiology
3
363 - Other social problems & services
2
543 - Analytical chemistry
2
574 - [Unassigned]
2
576 - Genetics & evolution
2
615 - Pharmacology & therapeutics
2
628 - Sanitary & municipal engineering
2
000 - Computer science, information & general works
1
330 - Economics
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
535 - Light & infrared & ultraviolet phenomena
1
537 - Electricity & electronics
1
542 - Techniques, equipment & materials
1
572 - Biochemistry
1
577 - Ecology
1
579 - Microorganisms, fungi & algae
1
622 - Mining & related operations
1
629 - Other branches of engineering
1
664 - Food technology
1
665 - Industrial oils, fats, waxes & gases
1
667 - Cleaning, color & coating technologies
1
677 - Textiles
1
686 - Printing & related activities
1
800 - Literature & rhetoric
1
900 - History & geography
1