Classification
629 - Other branches of engineering
381
621 - Applied physics
107
624 - Civil engineering
51
620 - Engineering & allied operations
44
006 - Special computer methods
36
658 - General management
36
333 - Economics of land & energy
25
690 - Buildings
22
307 - Communities
17
330 - Economics
16
304 - Factors affecting social behavior
15
004 - Data processing & computer science
14
691 - Building materials
14
005 - Computer programming, programs & data
9
670 - Manufacturing
9
338 - Production
8
623 - Military & nautical engineering
8
720 - Architecture
7
910 - Geography & travel
7
003 - Systems
6
625 - Engineering of railroads & roads
6
303 - Social processes
5
515 - Analysis
5
519 - Probabilities & applied mathematics
5
600 - Technology
5
388 - Transportation; ground transportation
4
660 - Chemical engineering
4
158 - Applied psychology
3
530 - Physics
3
627 - Hydraulic engineering
3
628 - Sanitary & municipal engineering
3
696 - Utilities
3
320 - Political science
2
321 - Systems of governments & states
2
380 - Commerce, communications & transportation
2
900 - History & geography
2
000 - Computer science, information & general works
1
306 - Culture & institutions
1
332 - Financial economics
1
337 - International economics
1
340 - Law
1
341 - Law of nations
1
346 - Private law
1
352 - General considerations of public administration
1
363 - Other social problems & services
1
370 - Education
1
381 - Commerce
1
407 - Education, research & related topics
1
518 - Numerical analysis
1
531 - Classical mechanics; solid mechanics
1
more ...