Classification
600 - Technology
620 - Engineering & allied operations
363 - Other social problems & services
48
630 - Agriculture & related technologies
44
900 - History & geography
24
333 - Economics of land & energy
17
330 - Economics
16
300 - Social sciences
15
540 - Chemistry & allied sciences
13
320 - Political science
12
380 - Commerce, communications & transportation
10
700 - The arts; fine & decorative arts
9
140 - Specific philosophical schools
8
551 - Geology, hydrology & meteorology
8
610 - Medicine & health
8
000 - Computer science, information & general works
7
100 - Philosophy & psychology
6
530 - Physics
5
581 - Specific topics in natural history
5
500 - Natural sciences & mathematics
4
580 - Plants (Botany)
4
800 - Literature & rhetoric
4
301 - Sociology & anthropology
3
590 - Animals (Zoology)
3
720 - Architecture
3
200 - Religion
2
410 - Linguistics
2
550 - Earth sciences
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
340 - Law
1
364 - Criminology
1