Classification
624 - Civil engineering
427
551 - Geology, hydrology & meteorology
81
620 - Engineering & allied operations
42
363 - Other social problems & services
34
690 - Buildings
34
621 - Applied physics
31
550 - Earth sciences
20
333 - Economics of land & energy
16
531 - Classical mechanics; solid mechanics
16
628 - Sanitary & municipal engineering
16
691 - Building materials
13
627 - Hydraulic engineering
11
629 - Other branches of engineering
7
662 - Explosives, fuels & related products
7
910 - Geography & travel
7
006 - Special computer methods
5
577 - Ecology
5
519 - Probabilities & applied mathematics
4
526 - Mathematical geography
4
660 - Chemical engineering
4
304 - Factors affecting social behavior
3
500 - Natural sciences & mathematics
3
530 - Physics
3
622 - Mining & related operations
3
003 - Systems
2
515 - Analysis
2
532 - Fluid mechanics; liquid mechanics
2
533 - Gas mechanics
2
536 - Heat
2
693 - Specific materials & purposes
2
000 - Computer science, information & general works
1
004 - Data processing & computer science
1
352 - General considerations of public administration
1
549 - Mineralogy
1
576 - Genetics & evolution
1
600 - Technology
1
610 - Medicine & health
1
625 - Engineering of railroads & roads
1
670 - Manufacturing
1