Classification
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
67
000 - Computer science, information & general works
58
363 - Other social problems & services
52
333 - Economics of land & energy
47
600 - Technology
38
330 - Economics
37
380 - Commerce, communications & transportation
34
320 - Political science
33
620 - Engineering & allied operations
30
900 - History & geography
30
610 - Medicine & health
27
140 - Specific philosophical schools
20
630 - Agriculture & related technologies
18
580 - Plants (Botany)
17
370 - Education
14
576 - Genetics & evolution
13
500 - Natural sciences & mathematics
12
581 - Specific topics in natural history
12
658 - General management
9
800 - Literature & rhetoric
9
414 - Phonology & phonetics
7
530 - Physics
7
550 - Earth sciences
7
720 - Architecture
7
540 - Chemistry & allied sciences
5
300 - Social sciences
4
304 - Factors affecting social behavior
4
612 - Human physiology
4
340 - Law
3
400 - Language
3
100 - Philosophy & psychology
2
361 - Social problems & social welfare in general
2
170 - Ethics
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
770 - Photography, photographs & computer art
1