Classification
900 - History & geography
185
100 - Philosophy & psychology
53
500 - Natural sciences & mathematics
36
300 - Social sciences
35
610 - Medicine & health
33
600 - Technology
29
700 - The arts; fine & decorative arts
22
140 - Specific philosophical schools
18
800 - Literature & rhetoric
17
320 - Political science
16
120 - Epistemology, causation & humankind
12
200 - Religion
12
170 - Ethics
10
301 - Sociology & anthropology
10
530 - Physics
10
363 - Other social problems & services
9
370 - Education
8
576 - Genetics & evolution
8
297 - Islam, Babism & Bahai Faith
6
000 - Computer science, information & general works
5
330 - Economics
5
400 - Language
5
410 - Linguistics
5
520 - Astronomy & allied sciences
5
333 - Economics of land & energy
4
620 - Engineering & allied operations
4
160 - Logic
3
380 - Commerce, communications & transportation
3
540 - Chemistry & allied sciences
3
340 - Law
2
720 - Architecture
2
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
398 - Folklore
1
550 - Earth sciences
1
580 - Plants (Botany)
1
612 - Human physiology
1
630 - Agriculture & related technologies
1
658 - General management
1
770 - Photography, photographs & computer art
1