Classification
320 - Political science
330 - Economics
618
900 - History & geography
571
333 - Economics of land & energy
475
700 - The arts; fine & decorative arts
466
300 - Social sciences
444
363 - Other social problems & services
356
100 - Philosophy & psychology
275
000 - Computer science, information & general works
270
140 - Specific philosophical schools
267
600 - Technology
262
340 - Law
207
380 - Commerce, communications & transportation
204
370 - Education
192
200 - Religion
179
551 - Geology, hydrology & meteorology
178
610 - Medicine & health
172
620 - Engineering & allied operations
131
301 - Sociology & anthropology
126
304 - Factors affecting social behavior
116
170 - Ethics
109
800 - Literature & rhetoric
102
630 - Agriculture & related technologies
77
581 - Specific topics in natural history
76
400 - Language
67
361 - Social problems & social welfare in general
61
576 - Genetics & evolution
61
297 - Islam, Babism & Bahai Faith
54
720 - Architecture
53
350 - Public administration & military science
49
410 - Linguistics
46
658 - General management
42
780 - Music
37
580 - Plants (Botany)
35
500 - Natural sciences & mathematics
34
530 - Physics
24
360 - Social problems & services; associations
22
120 - Epistemology, causation & humankind
19
540 - Chemistry & allied sciences
16
657 - Accounting
14
364 - Criminology
12
414 - Phonology & phonetics
12
770 - Photography, photographs & computer art
10
550 - Earth sciences
8
791 - Public performances
8
336 - Public finance
7
520 - Astronomy & allied sciences
5
615 - Pharmacology & therapeutics
5
296 - Judaism
3
398 - Folklore
3
more ...