Classification
900 - History & geography
320 - Political science
408
330 - Economics
379
800 - Literature & rhetoric
44
300 - Social sciences
37
700 - The arts; fine & decorative arts
37
576 - Genetics & evolution
31
340 - Law
22
370 - Education
22
380 - Commerce, communications & transportation
17
333 - Economics of land & energy
11
600 - Technology
11
891 - East Indo-European & Celtic literatures
11
620 - Engineering & allied operations
10
363 - Other social problems & services
9
140 - Specific philosophical schools
8
400 - Language
8
200 - Religion
7
780 - Music
7
000 - Computer science, information & general works
6
304 - Factors affecting social behavior
6
410 - Linguistics
5
610 - Medicine & health
4
297 - Islam, Babism & Bahai Faith
3
301 - Sociology & anthropology
3
551 - Geology, hydrology & meteorology
3
100 - Philosophy & psychology
2
331 - Labor economics
2
658 - General management
2
720 - Architecture
2
943 - Central Europe; Germany
2
947 - Eastern Europe; Russia
2
170 - Ethics
1
280 - Christian denominations & sects
1
281 - Early church & Eastern churches
1
296 - Judaism
1
302 - Social interaction
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
398 - Folklore
1
414 - Phonology & phonetics
1
491 - East Indo-European & Celtic languages
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
657 - Accounting
1
709 - Historical, geographic & persons treatment
1
770 - Photography, photographs & computer art
1
781 - General principles & musical forms
1
more ...