Classification
000 - Computer science, information & general works
380 - Commerce, communications & transportation
620 - Engineering & allied operations
600 - Technology
95
700 - The arts; fine & decorative arts
74
900 - History & geography
64
333 - Economics of land & energy
57
363 - Other social problems & services
39
330 - Economics
29
140 - Specific philosophical schools
23
500 - Natural sciences & mathematics
20
576 - Genetics & evolution
19
610 - Medicine & health
19
630 - Agriculture & related technologies
18
580 - Plants (Botany)
16
720 - Architecture
14
551 - Geology, hydrology & meteorology
13
320 - Political science
12
540 - Chemistry & allied sciences
12
370 - Education
9
400 - Language
9
414 - Phonology & phonetics
8
340 - Law
7
658 - General management
7
300 - Social sciences
6
530 - Physics
5
170 - Ethics
4
410 - Linguistics
4
581 - Specific topics in natural history
4
612 - Human physiology
4
800 - Literature & rhetoric
4
100 - Philosophy & psychology
2
780 - Music
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
384 - Communications; telecommunication
1
657 - Accounting
1
745 - Decorative arts
1
770 - Photography, photographs & computer art
1
808 - Rhetoric & collections of literature
1