Classification
005 - Computer programming, programs & data
253
658 - General management
188
004 - Data processing & computer science
187
381 - Commerce
156
330 - Economics
145
006 - Special computer methods
72
303 - Social processes
30
621 - Applied physics
29
003 - Systems
22
650 - Management & auxiliary services
19
025 - Library operations
18
338 - Production
17
670 - Manufacturing
17
620 - Engineering & allied operations
14
659 - Advertising & public relations
10
333 - Economics of land & energy
6
343 - Military, tax, trade & industrial law
6
600 - Technology
6
500 - Natural sciences & mathematics
5
610 - Medicine & health
5
346 - Private law
4
371 - Schools & their activities; special education
4
000 - Computer science, information & general works
3
332 - Financial economics
3
518 - Numerical analysis
3
001 - Knowledge
2
174 - Occupational ethics
2
300 - Social sciences
2
302 - Social interaction
2
304 - Factors affecting social behavior
2
339 - Macroeconomics & related topics
2
351 - Public administration
2
362 - Social welfare problems & services
2
657 - Accounting
2
700 - The arts; fine & decorative arts
2
720 - Architecture
2
020 - Library & information sciences
1
140 - Specific philosophical schools
1
170 - Ethics
1
305 - Social groups
1
320 - Political science
1
323 - Civil & political rights
1
331 - Labor economics
1
336 - Public finance
1
340 - Law
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
512 - Algebra
1
519 - Probabilities & applied mathematics
1
more ...