Classification
100 - Philosophy & psychology
320 - Political science
576 - Genetics & evolution
900 - History & geography
18
330 - Economics
10
333 - Economics of land & energy
5
300 - Social sciences
4
340 - Law
4
363 - Other social problems & services
4
600 - Technology
4
200 - Religion
3
301 - Sociology & anthropology
3
581 - Specific topics in natural history
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
370 - Education
2
610 - Medicine & health
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1
551 - Geology, hydrology & meteorology
1
620 - Engineering & allied operations
1
920 - Biography, genealogy & insignia
1