Classification
620 - Engineering & allied operations
500 - Natural sciences & mathematics
2,316
005 - Computer programming, programs & data
1,829
621 - Applied physics
1,061
658 - General management
1,014
384 - Communications; telecommunication
932
331 - Labor economics
836
745 - Decorative arts
743
330 - Economics
417
000 - Computer science, information & general works
401
004 - Data processing & computer science
357
006 - Special computer methods
335
629 - Other branches of engineering
211
302 - Social interaction
194
338 - Production
164
510 - Mathematics
159
374 - Adult education
150
770 - Photography, photographs & computer art
128
300 - Social sciences
101
670 - Manufacturing
93
600 - Technology
78
781 - General principles & musical forms
69
381 - Commerce
63
681 - Precision instruments & other devices
51
660 - Chemical engineering
46
153 - Mental processes & intelligence
45
519 - Probabilities & applied mathematics
43
001 - Knowledge
36
333 - Economics of land & energy
36
003 - Systems
34
332 - Financial economics
34
624 - Civil engineering
33
610 - Medicine & health
30
790 - Recreational & performing arts
28
628 - Sanitary & municipal engineering
26
363 - Other social problems & services
25
686 - Printing & related activities
23
741 - Drawing & drawings
22
650 - Management & auxiliary services
21
794 - Indoor games of skill
19
303 - Social processes
16
158 - Applied psychology
14
910 - Geography & travel
14
662 - Explosives, fuels & related products
13
622 - Mining & related operations
12
740 - Drawing & decorative arts
12
604 - Special topics
11
304 - Factors affecting social behavior
10
380 - Commerce, communications & transportation
10
623 - Military & nautical engineering
10
more ...