Classification
331 - Labor economics
1,321
005 - Computer programming, programs & data
1,311
330 - Economics
968
620 - Engineering & allied operations
631
000 - Computer science, information & general works
515
320 - Political science
459
600 - Technology
452
658 - General management
445
700 - The arts; fine & decorative arts
409
500 - Natural sciences & mathematics
337
530 - Physics
328
900 - History & geography
316
333 - Economics of land & energy
296
621 - Applied physics
268
363 - Other social problems & services
256
610 - Medicine & health
239
374 - Adult education
238
380 - Commerce, communications & transportation
208
004 - Data processing & computer science
199
515 - Analysis
185
384 - Communications; telecommunication
154
539 - Modern physics
153
338 - Production
152
364 - Criminology
136
371 - Schools & their activities; special education
126
300 - Social sciences
112
370 - Education
112
340 - Law
111
006 - Special computer methods
97
140 - Specific philosophical schools
95
519 - Probabilities & applied mathematics
93
576 - Genetics & evolution
78
551 - Geology, hydrology & meteorology
77
580 - Plants (Botany)
77
629 - Other branches of engineering
70
660 - Chemical engineering
63
100 - Philosophy & psychology
59
670 - Manufacturing
56
150 - Psychology
54
302 - Social interaction
51
520 - Astronomy & allied sciences
47
540 - Chemistry & allied sciences
46
664 - Food technology
44
543 - Analytical chemistry
41
541 - Physical chemistry
40
630 - Agriculture & related technologies
39
510 - Mathematics
36
381 - Commerce
34
628 - Sanitary & municipal engineering
34
003 - Systems
33
more ...