Classification
320 - Political science
22
900 - History & geography
16
300 - Social sciences
14
700 - The arts; fine & decorative arts
12
100 - Philosophy & psychology
11
333 - Economics of land & energy
9
330 - Economics
7
340 - Law
7
363 - Other social problems & services
7
140 - Specific philosophical schools
6
370 - Education
6
600 - Technology
5
620 - Engineering & allied operations
5
200 - Religion
4
301 - Sociology & anthropology
4
576 - Genetics & evolution
4
120 - Epistemology, causation & humankind
3
380 - Commerce, communications & transportation
2
410 - Linguistics
2
530 - Physics
2
581 - Specific topics in natural history
2
170 - Ethics
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
400 - Language
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
800 - Literature & rhetoric
1