Classification
541 - Physical chemistry
300
620 - Engineering & allied operations
126
621 - Applied physics
110
540 - Chemistry & allied sciences
98
600 - Technology
30
700 - The arts; fine & decorative arts
25
000 - Computer science, information & general works
24
333 - Economics of land & energy
24
530 - Physics
16
543 - Analytical chemistry
16
660 - Chemical engineering
16
610 - Medicine & health
13
363 - Other social problems & services
12
546 - Inorganic chemistry
11
900 - History & geography
9
500 - Natural sciences & mathematics
8
547 - Organic chemistry
7
576 - Genetics & evolution
7
628 - Sanitary & municipal engineering
7
380 - Commerce, communications & transportation
6
574 - [Unassigned]
6
629 - Other branches of engineering
6
140 - Specific philosophical schools
5
572 - Biochemistry
5
667 - Cleaning, color & coating technologies
5
580 - Plants (Botany)
4
414 - Phonology & phonetics
3
551 - Geology, hydrology & meteorology
3
612 - Human physiology
3
670 - Manufacturing
3
800 - Literature & rhetoric
3
304 - Factors affecting social behavior
2
330 - Economics
2
539 - Modern physics
2
542 - Techniques, equipment & materials
2
570 - Life sciences; biology
2
571 - Physiology & related subjects
2
577 - Ecology
2
616 - Diseases
2
681 - Precision instruments & other devices
2
160 - Logic
1
341 - Law of nations
1
370 - Education
1
520 - Astronomy & allied sciences
1
536 - Heat
1
538 - Magnetism
1
578 - Natural history of organisms
1
615 - Pharmacology & therapeutics
1
630 - Agriculture & related technologies
1
631 - Techniques, equipment & materials
1
more ...