Classification
600 - Technology
35
620 - Engineering & allied operations
29
700 - The arts; fine & decorative arts
29
900 - History & geography
24
333 - Economics of land & energy
21
000 - Computer science, information & general works
15
576 - Genetics & evolution
13
363 - Other social problems & services
10
340 - Law
6
330 - Economics
5
380 - Commerce, communications & transportation
5
414 - Phonology & phonetics
5
540 - Chemistry & allied sciences
5
500 - Natural sciences & mathematics
4
610 - Medicine & health
4
630 - Agriculture & related technologies
4
530 - Physics
3
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
2
304 - Factors affecting social behavior
1
370 - Education
1
400 - Language
1
658 - General management
1
720 - Architecture
1
770 - Photography, photographs & computer art
1
800 - Literature & rhetoric
1