Classification
000 - Computer science, information & general works
330 - Economics
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
27
333 - Economics of land & energy
24
620 - Engineering & allied operations
19
363 - Other social problems & services
15
140 - Specific philosophical schools
13
380 - Commerce, communications & transportation
12
900 - History & geography
12
658 - General management
11
551 - Geology, hydrology & meteorology
10
630 - Agriculture & related technologies
9
320 - Political science
8
370 - Education
8
580 - Plants (Botany)
7
720 - Architecture
5
170 - Ethics
4
500 - Natural sciences & mathematics
4
576 - Genetics & evolution
4
581 - Specific topics in natural history
4
300 - Social sciences
3
340 - Law
3
361 - Social problems & social welfare in general
3
530 - Physics
3
100 - Philosophy & psychology
2
400 - Language
2
200 - Religion
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1
780 - Music
1
800 - Literature & rhetoric
1