Classification
005 - Computer programming, programs & data
7,272
500 - Natural sciences & mathematics
2,263
006 - Special computer methods
1,689
620 - Engineering & allied operations
1,579
000 - Computer science, information & general works
1,539
330 - Economics
1,288
004 - Data processing & computer science
1,269
658 - General management
1,234
331 - Labor economics
1,186
370 - Education
1,161
745 - Decorative arts
1,078
333 - Economics of land & energy
990
610 - Medicine & health
742
320 - Political science
699
621 - Applied physics
608
300 - Social sciences
464
794 - Indoor games of skill
413
600 - Technology
396
519 - Probabilities & applied mathematics
388
363 - Other social problems & services
376
304 - Factors affecting social behavior
351
384 - Communications; telecommunication
330
629 - Other branches of engineering
305
302 - Social interaction
267
510 - Mathematics
255
650 - Management & auxiliary services
238
616 - Diseases
204
338 - Production
201
900 - History & geography
185
380 - Commerce, communications & transportation
162
340 - Law
142
374 - Adult education
137
551 - Geology, hydrology & meteorology
136
700 - The arts; fine & decorative arts
131
001 - Knowledge
126
332 - Financial economics
123
301 - Sociology & anthropology
121
630 - Agriculture & related technologies
115
381 - Commerce
107
577 - Ecology
97
670 - Manufacturing
93
100 - Philosophy & psychology
89
003 - Systems
86
530 - Physics
86
306 - Culture & institutions
81
570 - Life sciences; biology
77
520 - Astronomy & allied sciences
72
371 - Schools & their activities; special education
69
910 - Geography & travel
66
518 - Numerical analysis
64
more ...