Classification
600 - Technology
25,679
005 - Computer programming, programs & data
24,424
004 - Data processing & computer science
15,763
006 - Special computer methods
14,913
500 - Natural sciences & mathematics
5,956
620 - Engineering & allied operations
5,909
331 - Labor economics
5,652
658 - General management
5,374
621 - Applied physics
5,031
000 - Computer science, information & general works
4,962
745 - Decorative arts
2,734
330 - Economics
2,514
519 - Probabilities & applied mathematics
2,433
530 - Physics
2,204
003 - Systems
1,628
384 - Communications; telecommunication
1,596
374 - Adult education
1,352
629 - Other branches of engineering
1,204
518 - Numerical analysis
1,085
302 - Social interaction
969
515 - Analysis
870
570 - Life sciences; biology
854
610 - Medicine & health
842
338 - Production
793
700 - The arts; fine & decorative arts
787
670 - Manufacturing
686
510 - Mathematics
674
381 - Commerce
614
300 - Social sciences
582
025 - Library operations
564
794 - Indoor games of skill
559
770 - Photography, photographs & computer art
509
333 - Economics of land & energy
508
371 - Schools & their activities; special education
430
900 - History & geography
398
511 - General principles of mathematics
367
380 - Commerce, communications & transportation
359
303 - Social processes
336
541 - Physical chemistry
314
650 - Management & auxiliary services
309
512 - Algebra
305
363 - Other social problems & services
296
364 - Criminology
288
332 - Financial economics
282
001 - Knowledge
281
140 - Specific philosophical schools
280
531 - Classical mechanics; solid mechanics
251
370 - Education
232
539 - Modern physics
218
720 - Architecture
201
more ...