Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
900 - History & geography
620 - Engineering & allied operations
57
700 - The arts; fine & decorative arts
48
333 - Economics of land & energy
44
363 - Other social problems & services
30
000 - Computer science, information & general works
24
320 - Political science
16
140 - Specific philosophical schools
12
370 - Education
12
340 - Law
11
551 - Geology, hydrology & meteorology
11
720 - Architecture
11
610 - Medicine & health
9
400 - Language
8
580 - Plants (Botany)
8
300 - Social sciences
6
304 - Factors affecting social behavior
6
576 - Genetics & evolution
6
658 - General management
6
630 - Agriculture & related technologies
5
100 - Philosophy & psychology
4
200 - Religion
4
500 - Natural sciences & mathematics
4
780 - Music
4
410 - Linguistics
3
800 - Literature & rhetoric
3
657 - Accounting
2
170 - Ethics
1
301 - Sociology & anthropology
1
530 - Physics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1