Classification
540 - Chemistry & allied sciences
68
700 - The arts; fine & decorative arts
54
320 - Political science
48
600 - Technology
45
000 - Computer science, information & general works
44
610 - Medicine & health
40
900 - History & geography
39
333 - Economics of land & energy
36
330 - Economics
34
620 - Engineering & allied operations
30
570 - Life sciences; biology
24
580 - Plants (Botany)
24
547 - Organic chemistry
22
363 - Other social problems & services
21
140 - Specific philosophical schools
20
300 - Social sciences
16
297 - Islam, Babism & Bahai Faith
15
200 - Religion
12
100 - Philosophy & psychology
11
380 - Commerce, communications & transportation
11
541 - Physical chemistry
11
576 - Genetics & evolution
11
370 - Education
10
414 - Phonology & phonetics
8
304 - Factors affecting social behavior
7
301 - Sociology & anthropology
6
800 - Literature & rhetoric
6
170 - Ethics
5
303 - Social processes
5
530 - Physics
5
551 - Geology, hydrology & meteorology
5
581 - Specific topics in natural history
5
630 - Agriculture & related technologies
5
324 - The political process
4
615 - Pharmacology & therapeutics
4
616 - Diseases
4
668 - Technology of other organic products
4
941 - British Isles
4
302 - Social interaction
3
340 - Law
3
364 - Criminology
3
500 - Natural sciences & mathematics
3
546 - Inorganic chemistry
3
574 - [Unassigned]
3
612 - Human physiology
3
660 - Chemical engineering
3
780 - Music
3
305 - Social groups
2
400 - Language
2
810 - American literature in English
2
more ...