Classification
600 - Technology
620 - Engineering & allied operations
100
363 - Other social problems & services
57
000 - Computer science, information & general works
51
300 - Social sciences
46
630 - Agriculture & related technologies
45
900 - History & geography
45
320 - Political science
43
333 - Economics of land & energy
41
330 - Economics
39
370 - Education
37
700 - The arts; fine & decorative arts
33
380 - Commerce, communications & transportation
31
100 - Philosophy & psychology
27
140 - Specific philosophical schools
27
610 - Medicine & health
18
551 - Geology, hydrology & meteorology
15
581 - Specific topics in natural history
15
170 - Ethics
13
301 - Sociology & anthropology
9
340 - Law
9
800 - Literature & rhetoric
8
200 - Religion
7
780 - Music
7
540 - Chemistry & allied sciences
6
410 - Linguistics
5
576 - Genetics & evolution
5
580 - Plants (Botany)
5
400 - Language
4
500 - Natural sciences & mathematics
4
520 - Astronomy & allied sciences
3
530 - Physics
3
590 - Animals (Zoology)
3
304 - Factors affecting social behavior
2
360 - Social problems & services; associations
2
361 - Social problems & social welfare in general
2
550 - Earth sciences
2
658 - General management
2
720 - Architecture
2
791 - Public performances
2
120 - Epistemology, causation & humankind
1
364 - Criminology
1
650 - Management & auxiliary services
1
657 - Accounting
1
770 - Photography, photographs & computer art
1