Classification
900 - History & geography
600 - Technology
104
620 - Engineering & allied operations
92
700 - The arts; fine & decorative arts
90
330 - Economics
89
320 - Political science
87
800 - Literature & rhetoric
49
333 - Economics of land & energy
43
000 - Computer science, information & general works
35
380 - Commerce, communications & transportation
35
576 - Genetics & evolution
28
300 - Social sciences
26
363 - Other social problems & services
23
340 - Law
21
610 - Medicine & health
20
140 - Specific philosophical schools
19
100 - Philosophy & psychology
16
370 - Education
16
410 - Linguistics
16
400 - Language
15
780 - Music
14
500 - Natural sciences & mathematics
13
580 - Plants (Botany)
13
301 - Sociology & anthropology
10
200 - Religion
8
551 - Geology, hydrology & meteorology
8
630 - Agriculture & related technologies
8
304 - Factors affecting social behavior
7
720 - Architecture
7
530 - Physics
6
581 - Specific topics in natural history
6
414 - Phonology & phonetics
5
540 - Chemistry & allied sciences
5
658 - General management
5
170 - Ethics
4
770 - Photography, photographs & computer art
4
791 - Public performances
3
297 - Islam, Babism & Bahai Faith
2
920 - Biography, genealogy & insignia
2
073 - Newspapers in central Europe; in Germany
1
327 - International relations
1
332 - Financial economics
1
398 - Folklore
1
520 - Astronomy & allied sciences
1
590 - Animals (Zoology)
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1