Classification
576 - Genetics & evolution
900 - History & geography
571
330 - Economics
477
320 - Political science
435
700 - The arts; fine & decorative arts
352
000 - Computer science, information & general works
337
600 - Technology
301
333 - Economics of land & energy
273
610 - Medicine & health
199
620 - Engineering & allied operations
198
500 - Natural sciences & mathematics
189
363 - Other social problems & services
182
380 - Commerce, communications & transportation
131
580 - Plants (Botany)
126
140 - Specific philosophical schools
119
300 - Social sciences
91
581 - Specific topics in natural history
79
540 - Chemistry & allied sciences
68
100 - Philosophy & psychology
58
551 - Geology, hydrology & meteorology
57
340 - Law
54
530 - Physics
47
800 - Literature & rhetoric
45
414 - Phonology & phonetics
43
400 - Language
41
304 - Factors affecting social behavior
39
370 - Education
38
720 - Architecture
37
658 - General management
35
630 - Agriculture & related technologies
32
301 - Sociology & anthropology
27
200 - Religion
23
612 - Human physiology
21
410 - Linguistics
19
170 - Ethics
17
297 - Islam, Babism & Bahai Faith
10
570 - Life sciences; biology
10
361 - Social problems & social welfare in general
8
615 - Pharmacology & therapeutics
8
520 - Astronomy & allied sciences
6
780 - Music
6
590 - Animals (Zoology)
5
616 - Diseases
5
550 - Earth sciences
4
650 - Management & auxiliary services
4
770 - Photography, photographs & computer art
4
791 - Public performances
4
120 - Epistemology, causation & humankind
3
160 - Logic
3
296 - Judaism
3
more ...