Classification
610 - Medicine & health
900 - History & geography
600 - Technology
230
620 - Engineering & allied operations
193
700 - The arts; fine & decorative arts
159
333 - Economics of land & energy
120
363 - Other social problems & services
75
140 - Specific philosophical schools
72
330 - Economics
72
320 - Political science
62
000 - Computer science, information & general works
57
100 - Philosophy & psychology
53
380 - Commerce, communications & transportation
47
580 - Plants (Botany)
44
300 - Social sciences
36
800 - Literature & rhetoric
33
370 - Education
31
576 - Genetics & evolution
23
200 - Religion
22
720 - Architecture
22
340 - Law
20
551 - Geology, hydrology & meteorology
19
630 - Agriculture & related technologies
19
500 - Natural sciences & mathematics
18
170 - Ethics
17
301 - Sociology & anthropology
14
414 - Phonology & phonetics
12
581 - Specific topics in natural history
11
304 - Factors affecting social behavior
10
361 - Social problems & social welfare in general
9
540 - Chemistry & allied sciences
9
400 - Language
8
530 - Physics
8
658 - General management
8
780 - Music
8
362 - Social welfare problems & services
7
615 - Pharmacology & therapeutics
7
410 - Linguistics
6
612 - Human physiology
6
616 - Diseases
4
120 - Epistemology, causation & humankind
3
297 - Islam, Babism & Bahai Faith
3
350 - Public administration & military science
3
398 - Folklore
3
614 - Incidence & prevention of disease
3
791 - Public performances
3
232 - Jesus Christ & his family
2
360 - Social problems & services; associations
2
364 - Criminology
2
550 - Earth sciences
2
more ...