Classification
551 - Geology, hydrology & meteorology
17
333 - Economics of land & energy
11
338 - Production
9
526 - Mathematical geography
9
550 - Earth sciences
9
660 - Chemical engineering
8
662 - Explosives, fuels & related products
7
553 - Economic geology
5
620 - Engineering & allied operations
5
621 - Applied physics
4
628 - Sanitary & municipal engineering
4
363 - Other social problems & services
3
629 - Other branches of engineering
3
549 - Mineralogy
2
577 - Ecology
2
330 - Economics
1
332 - Financial economics
1
344 - Labor, social, education & cultural law
1
531 - Classical mechanics; solid mechanics
1
541 - Physical chemistry
1
560 - Paleontology; paleozoology
1
600 - Technology
1
627 - Hydraulic engineering
1
641 - Food & drink
1
664 - Food technology
1
670 - Manufacturing
1
700 - The arts; fine & decorative arts
1