Classification
600 - Technology
17,153
004 - Data processing & computer science
4,910
621 - Applied physics
3,652
005 - Computer programming, programs & data
3,256
384 - Communications; telecommunication
2,467
380 - Commerce, communications & transportation
1,993
302 - Social interaction
1,875
006 - Special computer methods
1,714
658 - General management
1,584
330 - Economics
1,452
620 - Engineering & allied operations
761
320 - Political science
721
331 - Labor economics
604
500 - Natural sciences & mathematics
577
300 - Social sciences
479
000 - Computer science, information & general works
437
610 - Medicine & health
396
306 - Culture & institutions
331
700 - The arts; fine & decorative arts
312
003 - Systems
282
629 - Other branches of engineering
254
338 - Production
250
900 - History & geography
233
333 - Economics of land & energy
208
303 - Social processes
201
518 - Numerical analysis
201
370 - Education
198
070 - News media, journalism & publishing
181
301 - Sociology & anthropology
181
381 - Commerce
181
650 - Management & auxiliary services
175
670 - Manufacturing
169
745 - Decorative arts
148
570 - Life sciences; biology
141
140 - Specific philosophical schools
134
363 - Other social problems & services
132
400 - Language
126
808 - Rhetoric & collections of literature
126
410 - Linguistics
114
791 - Public performances
114
153 - Mental processes & intelligence
110
659 - Advertising & public relations
99
158 - Applied psychology
97
100 - Philosophy & psychology
91
530 - Physics
80
025 - Library operations
79
418 - Standard usage & applied linguistics
78
519 - Probabilities & applied mathematics
73
327 - International relations
70
150 - Psychology
69
more ...