Classification
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
17
363 - Other social problems & services
12
333 - Economics of land & energy
11
720 - Architecture
8
320 - Political science
7
330 - Economics
7
610 - Medicine & health
7
380 - Commerce, communications & transportation
6
600 - Technology
6
900 - History & geography
5
370 - Education
4
140 - Specific philosophical schools
3
581 - Specific topics in natural history
3
000 - Computer science, information & general works
2
300 - Social sciences
2
530 - Physics
2
620 - Engineering & allied operations
2
100 - Philosophy & psychology
1
340 - Law
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
658 - General management
1