Classification
333 - Economics of land & energy
556
621 - Applied physics
347
338 - Production
134
304 - Factors affecting social behavior
90
006 - Special computer methods
72
620 - Engineering & allied operations
33
629 - Other branches of engineering
31
363 - Other social problems & services
28
321 - Systems of governments & states
27
551 - Geology, hydrology & meteorology
24
658 - General management
24
660 - Chemical engineering
23
720 - Architecture
23
696 - Utilities
19
003 - Systems
18
628 - Sanitary & municipal engineering
17
670 - Manufacturing
14
036 - Encyclopedias in Spanish & Portuguese
13
577 - Ecology
12
910 - Geography & travel
12
330 - Economics
11
530 - Physics
11
630 - Agriculture & related technologies
10
690 - Buildings
10
624 - Civil engineering
9
320 - Political science
7
344 - Labor, social, education & cultural law
7
631 - Techniques, equipment & materials
7
004 - Data processing & computer science
6
343 - Military, tax, trade & industrial law
6
332 - Financial economics
5
627 - Hydraulic engineering
5
062 - Organizations in British Isles; in England
4
339 - Macroeconomics & related topics
4
519 - Probabilities & applied mathematics
4
301 - Sociology & anthropology
3
303 - Social processes
3
327 - International relations
3
337 - International economics
3
536 - Heat
3
541 - Physical chemistry
3
547 - Organic chemistry
3
550 - Earth sciences
3
579 - Microorganisms, fungi & algae
3
600 - Technology
3
667 - Cleaning, color & coating technologies
3
053 - Serials in other Germanic languages
2
170 - Ethics
2
174 - Occupational ethics
2
341 - Law of nations
2
more ...