Classification
900 - History & geography
317
800 - Literature & rhetoric
182
410 - Linguistics
103
370 - Education
80
300 - Social sciences
75
700 - The arts; fine & decorative arts
75
330 - Economics
72
100 - Philosophy & psychology
69
320 - Political science
61
340 - Law
52
600 - Technology
41
620 - Engineering & allied operations
35
720 - Architecture
35
380 - Commerce, communications & transportation
24
000 - Computer science, information & general works
23
610 - Medicine & health
21
363 - Other social problems & services
16
140 - Specific philosophical schools
15
301 - Sociology & anthropology
14
540 - Chemistry & allied sciences
14
333 - Economics of land & energy
12
530 - Physics
11
200 - Religion
10
500 - Natural sciences & mathematics
10
551 - Geology, hydrology & meteorology
9
580 - Plants (Botany)
8
581 - Specific topics in natural history
8
400 - Language
7
297 - Islam, Babism & Bahai Faith
4
630 - Agriculture & related technologies
4
780 - Music
4
170 - Ethics
3
304 - Factors affecting social behavior
3
520 - Astronomy & allied sciences
3
590 - Animals (Zoology)
3
615 - Pharmacology & therapeutics
3
360 - Social problems & services; associations
2
576 - Genetics & evolution
2
658 - General management
2
336 - Public finance
1
361 - Social problems & social welfare in general
1
612 - Human physiology
1
657 - Accounting
1
770 - Photography, photographs & computer art
1
791 - Public performances
1