Classification
330 - Economics
320 - Political science
66
658 - General management
50
333 - Economics of land & energy
42
610 - Medicine & health
42
304 - Factors affecting social behavior
36
363 - Other social problems & services
30
370 - Education
25
300 - Social sciences
24
338 - Production
24
600 - Technology
24
900 - History & geography
21
700 - The arts; fine & decorative arts
20
380 - Commerce, communications & transportation
19
500 - Natural sciences & mathematics
15
332 - Financial economics
14
302 - Social interaction
13
000 - Computer science, information & general works
12
331 - Labor economics
12
630 - Agriculture & related technologies
11
670 - Manufacturing
10
381 - Commerce
9
551 - Geology, hydrology & meteorology
9
650 - Management & auxiliary services
9
140 - Specific philosophical schools
8
158 - Applied psychology
8
340 - Law
8
620 - Engineering & allied operations
7
303 - Social processes
5
001 - Knowledge
4
100 - Philosophy & psychology
4
170 - Ethics
4
384 - Communications; telecommunication
4
006 - Special computer methods
3
153 - Mental processes & intelligence
3
301 - Sociology & anthropology
2
305 - Social groups
2
336 - Public finance
2
350 - Public administration & military science
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
800 - Literature & rhetoric
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
155 - Differential & developmental psychology
1
200 - Religion
1
339 - Macroeconomics & related topics
1
343 - Military, tax, trade & industrial law
1
361 - Social problems & social welfare in general
1
388 - Transportation; ground transportation
1
more ...