Classification
330 - Economics
207
320 - Political science
39
900 - History & geography
30
400 - Language
29
700 - The arts; fine & decorative arts
21
410 - Linguistics
13
800 - Literature & rhetoric
13
333 - Economics of land & energy
10
370 - Education
10
610 - Medicine & health
9
340 - Law
8
380 - Commerce, communications & transportation
8
300 - Social sciences
7
600 - Technology
7
363 - Other social problems & services
6
491 - East Indo-European & Celtic languages
6
620 - Engineering & allied operations
6
891 - East Indo-European & Celtic literatures
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
301 - Sociology & anthropology
4
630 - Agriculture & related technologies
4
940 - History of Europe
4
304 - Factors affecting social behavior
3
332 - Financial economics
3
580 - Plants (Botany)
3
720 - Architecture
3
100 - Philosophy & psychology
2
200 - Religion
2
500 - Natural sciences & mathematics
2
628 - Sanitary & municipal engineering
2
780 - Music
2
943 - Central Europe; Germany
2
149 - Other philosophical systems
1
170 - Ethics
1
282 - Roman Catholic Church
1
303 - Social processes
1
307 - Communities
1
323 - Civil & political rights
1
336 - Public finance
1
339 - Macroeconomics & related topics
1
341 - Law of nations
1
355 - Military science
1
361 - Social problems & social welfare in general
1
398 - Folklore
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
more ...