Classification
600 - Technology
610 - Medicine & health
630 - Agriculture & related technologies
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
32
000 - Computer science, information & general works
27
333 - Economics of land & energy
20
363 - Other social problems & services
20
580 - Plants (Botany)
19
330 - Economics
10
551 - Geology, hydrology & meteorology
8
140 - Specific philosophical schools
7
900 - History & geography
7
380 - Commerce, communications & transportation
6
340 - Law
5
414 - Phonology & phonetics
5
581 - Specific topics in natural history
5
658 - General management
5
540 - Chemistry & allied sciences
4
576 - Genetics & evolution
4
720 - Architecture
4
100 - Philosophy & psychology
3
300 - Social sciences
3
612 - Human physiology
3
170 - Ethics
2
304 - Factors affecting social behavior
2
320 - Political science
2
500 - Natural sciences & mathematics
2
800 - Literature & rhetoric
2
301 - Sociology & anthropology
1
350 - Public administration & military science
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
530 - Physics
1