Classification
900 - History & geography
149
330 - Economics
135
320 - Political science
98
333 - Economics of land & energy
60
363 - Other social problems & services
52
304 - Factors affecting social behavior
44
700 - The arts; fine & decorative arts
44
414 - Phonology & phonetics
31
610 - Medicine & health
31
551 - Geology, hydrology & meteorology
28
301 - Sociology & anthropology
27
370 - Education
27
800 - Literature & rhetoric
23
398 - Folklore
21
000 - Computer science, information & general works
20
581 - Specific topics in natural history
19
780 - Music
17
380 - Commerce, communications & transportation
15
400 - Language
12
720 - Architecture
12
630 - Agriculture & related technologies
9
140 - Specific philosophical schools
8
580 - Plants (Botany)
8
200 - Religion
7
300 - Social sciences
7
336 - Public finance
7
340 - Law
6
410 - Linguistics
6
600 - Technology
6
100 - Philosophy & psychology
4
590 - Animals (Zoology)
4
540 - Chemistry & allied sciences
3
770 - Photography, photographs & computer art
2
273 - Doctrinal controversies & heresies
1
331 - Labor economics
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
620 - Engineering & allied operations
1
657 - Accounting
1
920 - Biography, genealogy & insignia
1