Classification
628 - Sanitary & municipal engineering
41
333 - Economics of land & energy
16
551 - Geology, hydrology & meteorology
15
338 - Production
11
577 - Ecology
8
363 - Other social problems & services
7
550 - Earth sciences
7
624 - Civil engineering
5
519 - Probabilities & applied mathematics
4
621 - Applied physics
4
630 - Agriculture & related technologies
4
658 - General management
4
660 - Chemical engineering
4
620 - Engineering & allied operations
3
634 - Orchards, fruits & forestry
3
509 - Historical, geographic & persons treatment
2
526 - Mathematical geography
2
710 - Civic & landscape art
2
327 - International relations
1
340 - Law
1
500 - Natural sciences & mathematics
1
507 - Education, research & related topics
1
553 - Economic geology
1
576 - Genetics & evolution
1
579 - Microorganisms, fungi & algae
1
600 - Technology
1
650 - Management & auxiliary services
1
930 - History of ancient world to ca. 499
1