Classification
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
48
333 - Economics of land & energy
17
330 - Economics
11
540 - Chemistry & allied sciences
11
581 - Specific topics in natural history
11
900 - History & geography
11
630 - Agriculture & related technologies
9
320 - Political science
8
551 - Geology, hydrology & meteorology
8
140 - Specific philosophical schools
7
700 - The arts; fine & decorative arts
7
300 - Social sciences
6
580 - Plants (Botany)
3
590 - Animals (Zoology)
3
301 - Sociology & anthropology
2
410 - Linguistics
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
170 - Ethics
1
370 - Education
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
720 - Architecture
1