Classification
333 - Economics of land & energy
600 - Technology
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
76
900 - History & geography
67
000 - Computer science, information & general works
39
330 - Economics
26
580 - Plants (Botany)
26
380 - Commerce, communications & transportation
22
576 - Genetics & evolution
21
363 - Other social problems & services
18
414 - Phonology & phonetics
15
610 - Medicine & health
13
720 - Architecture
11
500 - Natural sciences & mathematics
9
340 - Law
6
530 - Physics
6
140 - Specific philosophical schools
5
540 - Chemistry & allied sciences
4
800 - Literature & rhetoric
4
551 - Geology, hydrology & meteorology
3
630 - Agriculture & related technologies
3
304 - Factors affecting social behavior
2
320 - Political science
2
370 - Education
2
400 - Language
2
658 - General management
2
160 - Logic
1
410 - Linguistics
1
581 - Specific topics in natural history
1