Classification
320 - Political science
800 - Literature & rhetoric
330 - Economics
260
900 - History & geography
119
700 - The arts; fine & decorative arts
42
200 - Religion
32
300 - Social sciences
29
100 - Philosophy & psychology
24
340 - Law
22
140 - Specific philosophical schools
21
380 - Commerce, communications & transportation
14
333 - Economics of land & energy
13
363 - Other social problems & services
13
400 - Language
13
600 - Technology
13
170 - Ethics
11
410 - Linguistics
10
630 - Agriculture & related technologies
10
000 - Computer science, information & general works
9
370 - Education
9
576 - Genetics & evolution
9
791 - Public performances
9
297 - Islam, Babism & Bahai Faith
7
551 - Geology, hydrology & meteorology
6
610 - Medicine & health
5
720 - Architecture
4
304 - Factors affecting social behavior
3
500 - Natural sciences & mathematics
3
580 - Plants (Botany)
3
620 - Engineering & allied operations
3
658 - General management
3
780 - Music
3
831 - German poetry
3
301 - Sociology & anthropology
2
350 - Public administration & military science
2
530 - Physics
2
581 - Specific topics in natural history
2
296 - Judaism
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
657 - Accounting
1
809 - History, description & criticism
1
818 - American miscellaneous writings
1
819 - (Optional number)
1
830 - Literatures of Germanic languages
1
833 - German fiction
1
843 - French fiction
1
882 - Classical Greek dramatic poetry & drama
1
891 - East Indo-European & Celtic literatures
1
more ...