Classification
330 - Economics
5,273
005 - Computer programming, programs & data
1,397
331 - Labor economics
1,371
620 - Engineering & allied operations
634
000 - Computer science, information & general works
505
658 - General management
461
320 - Political science
459
600 - Technology
453
700 - The arts; fine & decorative arts
409
500 - Natural sciences & mathematics
351
530 - Physics
331
900 - History & geography
316
333 - Economics of land & energy
297
621 - Applied physics
279
363 - Other social problems & services
250
374 - Adult education
237
610 - Medicine & health
234
004 - Data processing & computer science
213
380 - Commerce, communications & transportation
208
515 - Analysis
187
338 - Production
159
384 - Communications; telecommunication
158
539 - Modern physics
153
364 - Criminology
139
371 - Schools & their activities; special education
131
370 - Education
119
340 - Law
112
006 - Special computer methods
107
300 - Social sciences
106
140 - Specific philosophical schools
95
519 - Probabilities & applied mathematics
94
576 - Genetics & evolution
78
551 - Geology, hydrology & meteorology
77
580 - Plants (Botany)
77
629 - Other branches of engineering
72
660 - Chemical engineering
64
100 - Philosophy & psychology
59
670 - Manufacturing
58
302 - Social interaction
50
520 - Astronomy & allied sciences
46
540 - Chemistry & allied sciences
46
664 - Food technology
44
150 - Psychology
42
543 - Analytical chemistry
41
541 - Physical chemistry
40
630 - Agriculture & related technologies
39
368 - Insurance
37
510 - Mathematics
36
381 - Commerce
34
628 - Sanitary & municipal engineering
34
more ...