Classification
550 - Earth sciences
910 - Geography & travel
221
526 - Mathematical geography
196
320 - Political science
20
330 - Economics
18
000 - Computer science, information & general works
17
900 - History & geography
15
551 - Geology, hydrology & meteorology
14
700 - The arts; fine & decorative arts
13
600 - Technology
11
333 - Economics of land & energy
10
620 - Engineering & allied operations
10
363 - Other social problems & services
9
530 - Physics
9
380 - Commerce, communications & transportation
8
610 - Medicine & health
5
576 - Genetics & evolution
4
630 - Agriculture & related technologies
4
140 - Specific philosophical schools
3
300 - Social sciences
3
500 - Natural sciences & mathematics
3
304 - Factors affecting social behavior
2
370 - Education
2
414 - Phonology & phonetics
2
658 - General management
2
720 - Architecture
2
100 - Philosophy & psychology
1
301 - Sociology & anthropology
1
400 - Language
1
510 - Mathematics
1
580 - Plants (Botany)
1
770 - Photography, photographs & computer art
1