Classification
900 - History & geography
811
320 - Political science
669
330 - Economics
405
700 - The arts; fine & decorative arts
368
333 - Economics of land & energy
340
300 - Social sciences
258
140 - Specific philosophical schools
233
340 - Law
232
363 - Other social problems & services
231
370 - Education
223
600 - Technology
220
610 - Medicine & health
201
000 - Computer science, information & general works
185
800 - Literature & rhetoric
152
380 - Commerce, communications & transportation
139
620 - Engineering & allied operations
129
100 - Philosophy & psychology
127
304 - Factors affecting social behavior
108
200 - Religion
107
301 - Sociology & anthropology
102
551 - Geology, hydrology & meteorology
92
400 - Language
90
630 - Agriculture & related technologies
65
410 - Linguistics
63
581 - Specific topics in natural history
60
580 - Plants (Botany)
59
576 - Genetics & evolution
54
530 - Physics
46
170 - Ethics
45
780 - Music
39
297 - Islam, Babism & Bahai Faith
38
361 - Social problems & social welfare in general
38
720 - Architecture
36
500 - Natural sciences & mathematics
29
791 - Public performances
23
350 - Public administration & military science
21
658 - General management
18
540 - Chemistry & allied sciences
16
360 - Social problems & services; associations
15
414 - Phonology & phonetics
13
364 - Criminology
11
398 - Folklore
11
770 - Photography, photographs & computer art
10
296 - Judaism
9
612 - Human physiology
9
520 - Astronomy & allied sciences
8
657 - Accounting
7
550 - Earth sciences
5
120 - Epistemology, causation & humankind
3
615 - Pharmacology & therapeutics
3
more ...