Classification
320 - Political science
330 - Economics
610 - Medicine & health
304 - Factors affecting social behavior
155
333 - Economics of land & energy
114
370 - Education
68
363 - Other social problems & services
66
600 - Technology
45
700 - The arts; fine & decorative arts
32
900 - History & geography
30
630 - Agriculture & related technologies
29
000 - Computer science, information & general works
26
300 - Social sciences
24
340 - Law
20
140 - Specific philosophical schools
19
551 - Geology, hydrology & meteorology
19
361 - Social problems & social welfare in general
14
380 - Commerce, communications & transportation
13
100 - Philosophy & psychology
12
581 - Specific topics in natural history
12
658 - General management
11
620 - Engineering & allied operations
10
200 - Religion
7
336 - Public finance
7
170 - Ethics
5
580 - Plants (Botany)
5
301 - Sociology & anthropology
4
576 - Genetics & evolution
4
720 - Architecture
4
360 - Social problems & services; associations
3
500 - Natural sciences & mathematics
3
530 - Physics
3
550 - Earth sciences
3
350 - Public administration & military science
2
410 - Linguistics
2
650 - Management & auxiliary services
2
800 - Literature & rhetoric
2
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
657 - Accounting
1
780 - Music
1