Classification
530 - Physics
540 - Chemistry & allied sciences
700 - The arts; fine & decorative arts
21
000 - Computer science, information & general works
20
333 - Economics of land & energy
18
620 - Engineering & allied operations
13
500 - Natural sciences & mathematics
12
380 - Commerce, communications & transportation
10
600 - Technology
9
370 - Education
6
900 - History & geography
6
363 - Other social problems & services
5
576 - Genetics & evolution
5
330 - Economics
4
340 - Law
4
580 - Plants (Botany)
4
140 - Specific philosophical schools
3
300 - Social sciences
3
100 - Philosophy & psychology
2
320 - Political science
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
720 - Architecture
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
581 - Specific topics in natural history
1
658 - General management
1
800 - Literature & rhetoric
1