Classification
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
333 - Economics of land & energy
20
363 - Other social problems & services
18
900 - History & geography
18
620 - Engineering & allied operations
16
330 - Economics
12
000 - Computer science, information & general works
9
380 - Commerce, communications & transportation
7
551 - Geology, hydrology & meteorology
7
320 - Political science
6
720 - Architecture
6
140 - Specific philosophical schools
5
370 - Education
4
576 - Genetics & evolution
3
800 - Literature & rhetoric
3
340 - Law
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
658 - General management
2
170 - Ethics
1
200 - Religion
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
580 - Plants (Botany)
1
612 - Human physiology
1
630 - Agriculture & related technologies
1