Classification
000 - Computer science, information & general works
900 - History & geography
700 - The arts; fine & decorative arts
16
600 - Technology
15
620 - Engineering & allied operations
14
380 - Commerce, communications & transportation
10
333 - Economics of land & energy
9
330 - Economics
8
300 - Social sciences
7
320 - Political science
7
140 - Specific philosophical schools
4
363 - Other social problems & services
4
800 - Literature & rhetoric
4
340 - Law
3
400 - Language
3
410 - Linguistics
3
540 - Chemistry & allied sciences
3
581 - Specific topics in natural history
3
170 - Ethics
2
304 - Factors affecting social behavior
2
370 - Education
2
500 - Natural sciences & mathematics
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
610 - Medicine & health
2
720 - Architecture
2
100 - Philosophy & psychology
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
590 - Animals (Zoology)
1
630 - Agriculture & related technologies
1
780 - Music
1