Classification
620 - Engineering & allied operations
19,669
600 - Technology
14,502
621 - Applied physics
10,768
005 - Computer programming, programs & data
8,018
006 - Special computer methods
5,653
004 - Data processing & computer science
4,473
629 - Other branches of engineering
4,026
500 - Natural sciences & mathematics
2,690
658 - General management
2,360
900 - History & geography
1,871
624 - Civil engineering
1,803
003 - Systems
1,794
670 - Manufacturing
1,713
333 - Economics of land & energy
1,586
610 - Medicine & health
1,571
519 - Probabilities & applied mathematics
1,481
700 - The arts; fine & decorative arts
1,320
330 - Economics
1,292
363 - Other social problems & services
1,168
000 - Computer science, information & general works
1,090
384 - Communications; telecommunication
1,042
660 - Chemical engineering
974
530 - Physics
920
331 - Labor economics
910
040 - [Unassigned]
820
745 - Decorative arts
726
551 - Geology, hydrology & meteorology
635
690 - Buildings
593
380 - Commerce, communications & transportation
520
630 - Agriculture & related technologies
506
515 - Analysis
496
628 - Sanitary & municipal engineering
483
531 - Classical mechanics; solid mechanics
441
320 - Political science
418
518 - Numerical analysis
392
580 - Plants (Botany)
369
540 - Chemistry & allied sciences
346
338 - Production
336
571 - Physiology & related subjects
335
510 - Mathematics
296
550 - Earth sciences
262
140 - Specific philosophical schools
261
374 - Adult education
255
720 - Architecture
250
300 - Social sciences
230
576 - Genetics & evolution
226
541 - Physical chemistry
224
616 - Diseases
223
302 - Social interaction
205
570 - Life sciences; biology
203
more ...