Classification
620 - Engineering & allied operations
81
363 - Other social problems & services
17
333 - Economics of land & energy
12
534 - Sound & related vibrations
11
621 - Applied physics
10
600 - Technology
8
628 - Sanitary & municipal engineering
8
900 - History & geography
7
629 - Other branches of engineering
6
000 - Computer science, information & general works
5
610 - Medicine & health
5
660 - Chemical engineering
5
700 - The arts; fine & decorative arts
4
551 - Geology, hydrology & meteorology
3
624 - Civil engineering
3
690 - Buildings
3
338 - Production
2
380 - Commerce, communications & transportation
2
781 - General principles & musical forms
2
910 - Geography & travel
2
003 - Systems
1
304 - Factors affecting social behavior
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
510 - Mathematics
1
577 - Ecology
1
580 - Plants (Botany)
1
612 - Human physiology
1
613 - Personal health & safety
1
641 - Food & drink
1
658 - General management
1
664 - Food technology
1
670 - Manufacturing
1
691 - Building materials
1
697 - Heating, ventilating & air-conditioning
1
780 - Music
1