Classification
330 - Economics
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
46
620 - Engineering & allied operations
40
333 - Economics of land & energy
36
363 - Other social problems & services
22
000 - Computer science, information & general works
21
140 - Specific philosophical schools
16
320 - Political science
11
610 - Medicine & health
11
720 - Architecture
10
370 - Education
9
551 - Geology, hydrology & meteorology
9
580 - Plants (Botany)
6
400 - Language
5
576 - Genetics & evolution
5
630 - Agriculture & related technologies
5
340 - Law
4
658 - General management
4
100 - Philosophy & psychology
3
300 - Social sciences
3
304 - Factors affecting social behavior
3
581 - Specific topics in natural history
3
780 - Music
3
800 - Literature & rhetoric
3
200 - Religion
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
170 - Ethics
1
410 - Linguistics
1
414 - Phonology & phonetics
1
530 - Physics
1
550 - Earth sciences
1
770 - Photography, photographs & computer art
1