Classification
331 - Labor economics
1,296
005 - Computer programming, programs & data
1,278
330 - Economics
954
620 - Engineering & allied operations
627
000 - Computer science, information & general works
514
320 - Political science
455
600 - Technology
449
658 - General management
440
700 - The arts; fine & decorative arts
406
500 - Natural sciences & mathematics
332
530 - Physics
328
900 - History & geography
311
333 - Economics of land & energy
293
621 - Applied physics
270
363 - Other social problems & services
253
610 - Medicine & health
240
374 - Adult education
229
380 - Commerce, communications & transportation
206
004 - Data processing & computer science
196
515 - Analysis
186
384 - Communications; telecommunication
154
539 - Modern physics
153
338 - Production
149
364 - Criminology
133
371 - Schools & their activities; special education
116
300 - Social sciences
113
340 - Law
109
370 - Education
106
140 - Specific philosophical schools
99
006 - Special computer methods
93
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
57
670 - Manufacturing
56
150 - Psychology
54
302 - Social interaction
53
520 - Astronomy & allied sciences
47
664 - Food technology
44
543 - Analytical chemistry
41
541 - Physical chemistry
40
630 - Agriculture & related technologies
39
540 - Chemistry & allied sciences
38
510 - Mathematics
36
381 - Commerce
34
628 - Sanitary & municipal engineering
34
003 - Systems
33
more ...