Classification
330 - Economics
630 - Agriculture & related technologies
320 - Political science
130
600 - Technology
82
333 - Economics of land & energy
74
363 - Other social problems & services
69
700 - The arts; fine & decorative arts
66
620 - Engineering & allied operations
51
300 - Social sciences
36
000 - Computer science, information & general works
28
900 - History & geography
26
610 - Medicine & health
25
380 - Commerce, communications & transportation
20
581 - Specific topics in natural history
17
140 - Specific philosophical schools
16
551 - Geology, hydrology & meteorology
16
580 - Plants (Botany)
16
370 - Education
13
340 - Law
12
540 - Chemistry & allied sciences
9
304 - Factors affecting social behavior
7
658 - General management
7
100 - Philosophy & psychology
6
301 - Sociology & anthropology
5
500 - Natural sciences & mathematics
4
350 - Public administration & military science
3
576 - Genetics & evolution
3
657 - Accounting
3
200 - Religion
2
400 - Language
2
410 - Linguistics
2
414 - Phonology & phonetics
2
720 - Architecture
2
770 - Photography, photographs & computer art
2
780 - Music
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
520 - Astronomy & allied sciences
1
530 - Physics
1
550 - Earth sciences
1
590 - Animals (Zoology)
1
612 - Human physiology
1
800 - Literature & rhetoric
1