Classification
363 - Other social problems & services
65
624 - Civil engineering
31
551 - Geology, hydrology & meteorology
21
628 - Sanitary & municipal engineering
20
577 - Ecology
18
660 - Chemical engineering
18
333 - Economics of land & energy
16
620 - Engineering & allied operations
11
630 - Agriculture & related technologies
8
690 - Buildings
5
338 - Production
4
526 - Mathematical geography
4
550 - Earth sciences
4
621 - Applied physics
4
641 - Food & drink
4
664 - Food technology
4
549 - Mineralogy
3
910 - Geography & travel
3
330 - Economics
2
519 - Probabilities & applied mathematics
2
532 - Fluid mechanics; liquid mechanics
2
533 - Gas mechanics
2
541 - Physical chemistry
2
572 - Biochemistry
2
600 - Technology
2
613 - Personal health & safety
2
670 - Manufacturing
2
003 - Systems
1
006 - Special computer methods
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
307 - Communities
1
320 - Political science
1
371 - Schools & their activities; special education
1
418 - Standard usage & applied linguistics
1
510 - Mathematics
1
530 - Physics
1
547 - Organic chemistry
1
553 - Economic geology
1
570 - Life sciences; biology
1
571 - Physiology & related subjects
1
579 - Microorganisms, fungi & algae
1
580 - Plants (Botany)
1
590 - Animals (Zoology)
1
604 - Special topics
1
627 - Hydraulic engineering
1
658 - General management
1