Classification
580 - Plants (Botany)
600 - Technology
620 - Engineering & allied operations
74
333 - Economics of land & energy
65
700 - The arts; fine & decorative arts
55
363 - Other social problems & services
46
900 - History & geography
46
000 - Computer science, information & general works
45
330 - Economics
39
630 - Agriculture & related technologies
35
380 - Commerce, communications & transportation
21
551 - Geology, hydrology & meteorology
16
610 - Medicine & health
16
720 - Architecture
12
658 - General management
11
576 - Genetics & evolution
10
140 - Specific philosophical schools
8
340 - Law
8
320 - Political science
7
500 - Natural sciences & mathematics
6
370 - Education
5
414 - Phonology & phonetics
5
612 - Human physiology
5
800 - Literature & rhetoric
4
300 - Social sciences
3
540 - Chemistry & allied sciences
3
170 - Ethics
2
336 - Public finance
2
361 - Social problems & social welfare in general
2
530 - Physics
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
400 - Language
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1