Classification
380 - Commerce, communications & transportation
600 - Technology
30
700 - The arts; fine & decorative arts
25
000 - Computer science, information & general works
20
333 - Economics of land & energy
19
620 - Engineering & allied operations
19
330 - Economics
16
900 - History & geography
13
363 - Other social problems & services
12
140 - Specific philosophical schools
9
610 - Medicine & health
9
658 - General management
9
320 - Political science
8
720 - Architecture
7
400 - Language
6
576 - Genetics & evolution
6
370 - Education
5
551 - Geology, hydrology & meteorology
5
338 - Production
4
384 - Communications; telecommunication
4
500 - Natural sciences & mathematics
4
530 - Physics
4
300 - Social sciences
3
540 - Chemistry & allied sciences
3
800 - Literature & rhetoric
3
340 - Law
2
580 - Plants (Botany)
2
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1