Classification
900 - History & geography
97
700 - The arts; fine & decorative arts
43
320 - Political science
31
200 - Religion
30
300 - Social sciences
27
330 - Economics
21
800 - Literature & rhetoric
21
000 - Computer science, information & general works
20
100 - Philosophy & psychology
20
301 - Sociology & anthropology
20
333 - Economics of land & energy
20
363 - Other social problems & services
18
600 - Technology
18
610 - Medicine & health
17
297 - Islam, Babism & Bahai Faith
16
551 - Geology, hydrology & meteorology
15
140 - Specific philosophical schools
14
620 - Engineering & allied operations
14
400 - Language
13
380 - Commerce, communications & transportation
12
340 - Law
10
304 - Factors affecting social behavior
8
370 - Education
8
410 - Linguistics
8
170 - Ethics
7
576 - Genetics & evolution
7
580 - Plants (Botany)
6
581 - Specific topics in natural history
6
720 - Architecture
6
120 - Epistemology, causation & humankind
5
630 - Agriculture & related technologies
5
520 - Astronomy & allied sciences
4
780 - Music
4
361 - Social problems & social welfare in general
2
530 - Physics
2
550 - Earth sciences
2
350 - Public administration & military science
1
398 - Folklore
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1
658 - General management
1
770 - Photography, photographs & computer art
1