Classification
330 - Economics
320 - Political science
311
630 - Agriculture & related technologies
179
300 - Social sciences
74
333 - Economics of land & energy
68
700 - The arts; fine & decorative arts
52
600 - Technology
51
000 - Computer science, information & general works
46
363 - Other social problems & services
43
620 - Engineering & allied operations
39
900 - History & geography
36
340 - Law
33
580 - Plants (Botany)
32
551 - Geology, hydrology & meteorology
25
610 - Medicine & health
24
380 - Commerce, communications & transportation
19
140 - Specific philosophical schools
17
581 - Specific topics in natural history
15
658 - General management
12
370 - Education
9
576 - Genetics & evolution
8
304 - Factors affecting social behavior
7
361 - Social problems & social welfare in general
6
530 - Physics
6
500 - Natural sciences & mathematics
5
540 - Chemistry & allied sciences
5
720 - Architecture
4
414 - Phonology & phonetics
3
657 - Accounting
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
160 - Logic
2
400 - Language
2
550 - Earth sciences
2
780 - Music
2
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
336 - Public finance
1
338 - Production
1
360 - Social problems & services; associations
1
520 - Astronomy & allied sciences
1
770 - Photography, photographs & computer art
1