Classification
320 - Political science
580 - Plants (Botany)
363 - Other social problems & services
19
700 - The arts; fine & decorative arts
19
330 - Economics
18
000 - Computer science, information & general works
17
333 - Economics of land & energy
16
600 - Technology
16
551 - Geology, hydrology & meteorology
14
620 - Engineering & allied operations
11
380 - Commerce, communications & transportation
10
630 - Agriculture & related technologies
10
140 - Specific philosophical schools
8
900 - History & geography
8
610 - Medicine & health
7
720 - Architecture
7
340 - Law
5
304 - Factors affecting social behavior
4
581 - Specific topics in natural history
4
658 - General management
4
361 - Social problems & social welfare in general
3
800 - Literature & rhetoric
3
300 - Social sciences
2
576 - Genetics & evolution
2
100 - Philosophy & psychology
1
170 - Ethics
1
336 - Public finance
1
370 - Education
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
540 - Chemistry & allied sciences
1