Classification
900 - History & geography
883
320 - Political science
767
330 - Economics
464
700 - The arts; fine & decorative arts
446
300 - Social sciences
382
333 - Economics of land & energy
373
340 - Law
274
363 - Other social problems & services
263
370 - Education
246
140 - Specific philosophical schools
242
600 - Technology
240
610 - Medicine & health
218
000 - Computer science, information & general works
207
800 - Literature & rhetoric
178
380 - Commerce, communications & transportation
154
100 - Philosophy & psychology
149
620 - Engineering & allied operations
143
304 - Factors affecting social behavior
136
200 - Religion
132
301 - Sociology & anthropology
128
400 - Language
115
551 - Geology, hydrology & meteorology
104
410 - Linguistics
76
630 - Agriculture & related technologies
76
581 - Specific topics in natural history
70
580 - Plants (Botany)
61
576 - Genetics & evolution
56
361 - Social problems & social welfare in general
49
170 - Ethics
48
530 - Physics
48
780 - Music
45
720 - Architecture
43
297 - Islam, Babism & Bahai Faith
42
500 - Natural sciences & mathematics
36
350 - Public administration & military science
26
658 - General management
22
360 - Social problems & services; associations
21
540 - Chemistry & allied sciences
19
364 - Criminology
16
770 - Photography, photographs & computer art
14
414 - Phonology & phonetics
13
520 - Astronomy & allied sciences
13
791 - Public performances
13
398 - Folklore
12
612 - Human physiology
9
657 - Accounting
8
296 - Judaism
6
550 - Earth sciences
6
336 - Public finance
5
120 - Epistemology, causation & humankind
3
more ...