Classification
620 - Engineering & allied operations
600 - Technology
33
900 - History & geography
25
700 - The arts; fine & decorative arts
20
333 - Economics of land & energy
14
000 - Computer science, information & general works
12
363 - Other social problems & services
7
380 - Commerce, communications & transportation
6
610 - Medicine & health
6
330 - Economics
5
500 - Natural sciences & mathematics
5
510 - Mathematics
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
120 - Epistemology, causation & humankind
3
622 - Mining & related operations
3
629 - Other branches of engineering
3
720 - Architecture
3
551 - Geology, hydrology & meteorology
2
621 - Applied physics
2
630 - Agriculture & related technologies
2
657 - Accounting
2
745 - Decorative arts
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
320 - Political science
1
370 - Education
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
623 - Military & nautical engineering
1
681 - Precision instruments & other devices
1
770 - Photography, photographs & computer art
1
790 - Recreational & performing arts
1
794 - Indoor games of skill
1
800 - Literature & rhetoric
1