Classification
330 - Economics
107
900 - History & geography
50
320 - Political science
23
363 - Other social problems & services
21
610 - Medicine & health
20
304 - Factors affecting social behavior
19
370 - Education
18
333 - Economics of land & energy
17
700 - The arts; fine & decorative arts
13
414 - Phonology & phonetics
10
336 - Public finance
7
551 - Geology, hydrology & meteorology
7
581 - Specific topics in natural history
7
000 - Computer science, information & general works
6
380 - Commerce, communications & transportation
5
630 - Agriculture & related technologies
5
301 - Sociology & anthropology
4
340 - Law
4
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
540 - Chemistry & allied sciences
3
580 - Plants (Botany)
3
590 - Animals (Zoology)
3
600 - Technology
3
780 - Music
3
800 - Literature & rhetoric
3
400 - Language
2
770 - Photography, photographs & computer art
2
200 - Religion
1
300 - Social sciences
1
331 - Labor economics
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
398 - Folklore
1
410 - Linguistics
1
620 - Engineering & allied operations
1