Classification
000 - Computer science, information & general works
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
333 - Economics of land & energy
22
620 - Engineering & allied operations
20
900 - History & geography
19
140 - Specific philosophical schools
12
330 - Economics
11
320 - Political science
10
720 - Architecture
10
610 - Medicine & health
9
370 - Education
7
580 - Plants (Botany)
6
340 - Law
5
576 - Genetics & evolution
5
551 - Geology, hydrology & meteorology
4
630 - Agriculture & related technologies
4
200 - Religion
3
304 - Factors affecting social behavior
2
361 - Social problems & social welfare in general
2
400 - Language
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
530 - Physics
2
581 - Specific topics in natural history
2
612 - Human physiology
2
658 - General management
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
160 - Logic
1
170 - Ethics
1
300 - Social sciences
1
301 - Sociology & anthropology
1
410 - Linguistics
1
650 - Management & auxiliary services
1
657 - Accounting
1