Classification
658 - General management
195
330 - Economics
166
338 - Production
129
333 - Economics of land & energy
116
363 - Other social problems & services
105
304 - Factors affecting social behavior
64
628 - Sanitary & municipal engineering
62
620 - Engineering & allied operations
50
331 - Labor economics
48
670 - Manufacturing
37
500 - Natural sciences & mathematics
32
621 - Applied physics
27
660 - Chemical engineering
20
300 - Social sciences
19
332 - Financial economics
15
577 - Ecology
14
615 - Pharmacology & therapeutics
14
174 - Occupational ethics
13
302 - Social interaction
13
307 - Communities
13
551 - Geology, hydrology & meteorology
13
632 - Plant injuries, diseases & pests
13
720 - Architecture
12
320 - Political science
11
668 - Technology of other organic products
11
388 - Transportation; ground transportation
10
570 - Life sciences; biology
10
546 - Inorganic chemistry
9
745 - Decorative arts
9
614 - Incidence & prevention of disease
8
000 - Computer science, information & general works
7
004 - Data processing & computer science
7
631 - Techniques, equipment & materials
7
170 - Ethics
6
344 - Labor, social, education & cultural law
6
381 - Commerce
6
540 - Chemistry & allied sciences
6
547 - Organic chemistry
6
650 - Management & auxiliary services
6
006 - Special computer methods
5
301 - Sociology & anthropology
5
341 - Law of nations
5
384 - Communications; telecommunication
5
574 - [Unassigned]
5
630 - Agriculture & related technologies
5
662 - Explosives, fuels & related products
5
700 - The arts; fine & decorative arts
5
303 - Social processes
4
339 - Macroeconomics & related topics
4
340 - Law
4
more ...