Classification
000 - Computer science, information & general works
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
333 - Economics of land & energy
60
700 - The arts; fine & decorative arts
59
900 - History & geography
54
630 - Agriculture & related technologies
41
330 - Economics
40
380 - Commerce, communications & transportation
31
610 - Medicine & health
26
580 - Plants (Botany)
24
551 - Geology, hydrology & meteorology
18
320 - Political science
17
140 - Specific philosophical schools
15
720 - Architecture
14
370 - Education
13
658 - General management
10
576 - Genetics & evolution
9
340 - Law
7
500 - Natural sciences & mathematics
7
581 - Specific topics in natural history
7
400 - Language
6
540 - Chemistry & allied sciences
6
304 - Factors affecting social behavior
5
800 - Literature & rhetoric
5
100 - Philosophy & psychology
4
300 - Social sciences
4
414 - Phonology & phonetics
4
530 - Physics
3
170 - Ethics
2
361 - Social problems & social welfare in general
2
612 - Human physiology
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
410 - Linguistics
1
550 - Earth sciences
1
657 - Accounting
1
770 - Photography, photographs & computer art
1