Classification
600 - Technology
620 - Engineering & allied operations
900 - History & geography
30
700 - The arts; fine & decorative arts
22
333 - Economics of land & energy
14
000 - Computer science, information & general works
13
330 - Economics
12
363 - Other social problems & services
12
140 - Specific philosophical schools
11
610 - Medicine & health
11
380 - Commerce, communications & transportation
9
720 - Architecture
6
370 - Education
5
400 - Language
5
100 - Philosophy & psychology
4
580 - Plants (Botany)
4
500 - Natural sciences & mathematics
3
320 - Political science
2
340 - Law
2
410 - Linguistics
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
612 - Human physiology
2
630 - Agriculture & related technologies
2
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
658 - General management
1
800 - Literature & rhetoric
1