Classification
620 - Engineering & allied operations
20,617
600 - Technology
14,503
621 - Applied physics
11,721
005 - Computer programming, programs & data
8,154
004 - Data processing & computer science
5,450
629 - Other branches of engineering
4,603
006 - Special computer methods
3,794
500 - Natural sciences & mathematics
2,708
658 - General management
2,405
900 - History & geography
1,876
624 - Civil engineering
1,846
003 - Systems
1,744
670 - Manufacturing
1,736
333 - Economics of land & energy
1,619
610 - Medicine & health
1,588
519 - Probabilities & applied mathematics
1,481
700 - The arts; fine & decorative arts
1,321
330 - Economics
1,309
363 - Other social problems & services
1,187
000 - Computer science, information & general works
1,094
384 - Communications; telecommunication
1,045
660 - Chemical engineering
990
331 - Labor economics
926
530 - Physics
924
745 - Decorative arts
731
551 - Geology, hydrology & meteorology
641
690 - Buildings
598
380 - Commerce, communications & transportation
521
515 - Analysis
509
630 - Agriculture & related technologies
505
628 - Sanitary & municipal engineering
501
531 - Classical mechanics; solid mechanics
438
320 - Political science
420
518 - Numerical analysis
395
580 - Plants (Botany)
369
338 - Production
348
540 - Chemistry & allied sciences
346
571 - Physiology & related subjects
338
510 - Mathematics
308
616 - Diseases
280
550 - Earth sciences
264
140 - Specific philosophical schools
261
374 - Adult education
258
720 - Architecture
250
300 - Social sciences
239
576 - Genetics & evolution
226
541 - Physical chemistry
223
570 - Life sciences; biology
217
302 - Social interaction
203
520 - Astronomy & allied sciences
197
more ...