Classification
330 - Economics
620 - Engineering & allied operations
20
600 - Technology
12
333 - Economics of land & energy
10
363 - Other social problems & services
9
658 - General management
6
700 - The arts; fine & decorative arts
6
300 - Social sciences
5
302 - Social interaction
4
500 - Natural sciences & mathematics
4
630 - Agriculture & related technologies
4
670 - Manufacturing
4
551 - Geology, hydrology & meteorology
3
900 - History & geography
3
320 - Political science
2
338 - Production
2
350 - Public administration & military science
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
153 - Mental processes & intelligence
1
158 - Applied psychology
1
170 - Ethics
1
200 - Religion
1
331 - Labor economics
1
343 - Military, tax, trade & industrial law
1
380 - Commerce, communications & transportation
1
384 - Communications; telecommunication
1
414 - Phonology & phonetics
1
510 - Mathematics
1
550 - Earth sciences
1
580 - Plants (Botany)
1
650 - Management & auxiliary services
1
720 - Architecture
1