Classification
600 - Technology
18,444
004 - Data processing & computer science
6,589
005 - Computer programming, programs & data
4,955
331 - Labor economics
4,674
621 - Applied physics
3,704
006 - Special computer methods
2,835
658 - General management
1,513
000 - Computer science, information & general works
1,395
620 - Engineering & allied operations
1,218
500 - Natural sciences & mathematics
1,158
330 - Economics
1,079
700 - The arts; fine & decorative arts
1,018
384 - Communications; telecommunication
864
333 - Economics of land & energy
650
900 - History & geography
604
374 - Adult education
567
302 - Social interaction
531
610 - Medicine & health
493
380 - Commerce, communications & transportation
470
338 - Production
431
363 - Other social problems & services
354
003 - Systems
321
381 - Commerce
297
629 - Other branches of engineering
294
140 - Specific philosophical schools
254
518 - Numerical analysis
229
745 - Decorative arts
210
580 - Plants (Botany)
193
576 - Genetics & evolution
191
320 - Political science
171
300 - Social sciences
167
303 - Social processes
161
530 - Physics
126
519 - Probabilities & applied mathematics
123
670 - Manufacturing
123
370 - Education
120
364 - Criminology
119
720 - Architecture
109
551 - Geology, hydrology & meteorology
108
650 - Management & auxiliary services
101
025 - Library operations
98
340 - Law
98
630 - Agriculture & related technologies
87
540 - Chemistry & allied sciences
86
400 - Language
79
800 - Literature & rhetoric
78
612 - Human physiology
72
321 - Systems of governments & states
71
371 - Schools & their activities; special education
70
570 - Life sciences; biology
69
more ...