Classification
621 - Applied physics
5,201
005 - Computer programming, programs & data
4,933
004 - Data processing & computer science
2,818
620 - Engineering & allied operations
1,644
000 - Computer science, information & general works
1,636
658 - General management
1,515
331 - Labor economics
1,222
500 - Natural sciences & mathematics
1,216
006 - Special computer methods
1,164
374 - Adult education
980
330 - Economics
890
745 - Decorative arts
760
381 - Commerce
706
384 - Communications; telecommunication
429
600 - Technology
385
629 - Other branches of engineering
348
700 - The arts; fine & decorative arts
347
302 - Social interaction
305
530 - Physics
301
338 - Production
287
333 - Economics of land & energy
268
003 - Systems
238
011 - Bibliographies
234
610 - Medicine & health
219
794 - Indoor games of skill
215
900 - History & geography
191
380 - Commerce, communications & transportation
187
332 - Financial economics
171
670 - Manufacturing
166
300 - Social sciences
138
363 - Other social problems & services
119
540 - Chemistry & allied sciences
118
537 - Electricity & electronics
109
303 - Social processes
99
519 - Probabilities & applied mathematics
99
650 - Management & auxiliary services
95
541 - Physical chemistry
93
580 - Plants (Botany)
83
025 - Library operations
78
770 - Photography, photographs & computer art
76
778 - Fields & kinds of photography
75
140 - Specific philosophical schools
65
510 - Mathematics
63
576 - Genetics & evolution
62
686 - Printing & related activities
58
539 - Modern physics
48
518 - Numerical analysis
46
414 - Phonology & phonetics
45
660 - Chemical engineering
44
547 - Organic chemistry
39
more ...