Classification
620 - Engineering & allied operations
600 - Technology
13
900 - History & geography
13
510 - Mathematics
7
003 - Systems
5
500 - Natural sciences & mathematics
5
629 - Other branches of engineering
5
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
005 - Computer programming, programs & data
4
330 - Economics
4
363 - Other social problems & services
4
658 - General management
4
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
004 - Data processing & computer science
2
140 - Specific philosophical schools
2
331 - Labor economics
2
384 - Communications; telecommunication
2
519 - Probabilities & applied mathematics
2
800 - Literature & rhetoric
2
338 - Production
1
340 - Law
1
381 - Commerce
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
610 - Medicine & health
1
681 - Precision instruments & other devices
1
720 - Architecture
1
745 - Decorative arts
1