Classification
620 - Engineering & allied operations
74
621 - Applied physics
16
500 - Natural sciences & mathematics
13
610 - Medicine & health
10
600 - Technology
7
700 - The arts; fine & decorative arts
7
628 - Sanitary & municipal engineering
6
000 - Computer science, information & general works
5
338 - Production
5
363 - Other social problems & services
5
380 - Commerce, communications & transportation
5
570 - Life sciences; biology
5
660 - Chemical engineering
5
681 - Precision instruments & other devices
5
333 - Economics of land & energy
4
547 - Organic chemistry
4
616 - Diseases
4
530 - Physics
3
546 - Inorganic chemistry
3
549 - Mineralogy
3
615 - Pharmacology & therapeutics
3
658 - General management
3
414 - Phonology & phonetics
2
535 - Light & infrared & ultraviolet phenomena
2
540 - Chemistry & allied sciences
2
541 - Physical chemistry
2
543 - Analytical chemistry
2
576 - Genetics & evolution
2
623 - Military & nautical engineering
2
140 - Specific philosophical schools
1
331 - Labor economics
1
343 - Military, tax, trade & industrial law
1
538 - Magnetism
1
579 - Microorganisms, fungi & algae
1
580 - Plants (Botany)
1
667 - Cleaning, color & coating technologies
1
668 - Technology of other organic products
1
677 - Textiles
1
745 - Decorative arts
1
900 - History & geography
1