Classification
900 - History & geography
700 - The arts; fine & decorative arts
105
600 - Technology
82
380 - Commerce, communications & transportation
67
300 - Social sciences
62
620 - Engineering & allied operations
58
320 - Political science
51
000 - Computer science, information & general works
46
800 - Literature & rhetoric
46
140 - Specific philosophical schools
35
330 - Economics
31
333 - Economics of land & energy
29
370 - Education
26
100 - Philosophy & psychology
24
400 - Language
20
780 - Music
18
363 - Other social problems & services
17
200 - Religion
16
340 - Law
16
610 - Medicine & health
16
410 - Linguistics
15
576 - Genetics & evolution
15
791 - Public performances
14
301 - Sociology & anthropology
12
720 - Architecture
12
500 - Natural sciences & mathematics
7
581 - Specific topics in natural history
7
770 - Photography, photographs & computer art
7
304 - Factors affecting social behavior
6
530 - Physics
6
580 - Plants (Botany)
6
658 - General management
6
170 - Ethics
5
551 - Geology, hydrology & meteorology
5
630 - Agriculture & related technologies
5
120 - Epistemology, causation & humankind
4
297 - Islam, Babism & Bahai Faith
4
414 - Phonology & phonetics
4
540 - Chemistry & allied sciences
4
398 - Folklore
2
612 - Human physiology
2
920 - Biography, genealogy & insignia
2
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
650 - Management & auxiliary services
1