Classification
576 - Genetics & evolution
900 - History & geography
20
330 - Economics
17
320 - Political science
15
000 - Computer science, information & general works
9
610 - Medicine & health
9
333 - Economics of land & energy
7
700 - The arts; fine & decorative arts
7
400 - Language
6
600 - Technology
6
140 - Specific philosophical schools
5
100 - Philosophy & psychology
4
304 - Factors affecting social behavior
3
363 - Other social problems & services
3
370 - Education
3
530 - Physics
3
620 - Engineering & allied operations
3
200 - Religion
2
300 - Social sciences
2
301 - Sociology & anthropology
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
630 - Agriculture & related technologies
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
231 - God
1
340 - Law
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
380 - Commerce, communications & transportation
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
658 - General management
1