Classification
380 - Commerce, communications & transportation
330 - Economics
1,138
600 - Technology
668
384 - Communications; telecommunication
643
333 - Economics of land & energy
634
658 - General management
599
700 - The arts; fine & decorative arts
582
000 - Computer science, information & general works
580
610 - Medicine & health
508
620 - Engineering & allied operations
460
363 - Other social problems & services
441
900 - History & geography
428
320 - Political science
344
300 - Social sciences
264
140 - Specific philosophical schools
237
302 - Social interaction
235
500 - Natural sciences & mathematics
188
370 - Education
159
580 - Plants (Botany)
136
340 - Law
130
576 - Genetics & evolution
128
551 - Geology, hydrology & meteorology
119
808 - Rhetoric & collections of literature
114
630 - Agriculture & related technologies
111
400 - Language
101
331 - Labor economics
86
304 - Factors affecting social behavior
83
100 - Philosophy & psychology
79
381 - Commerce
76
650 - Management & auxiliary services
68
540 - Chemistry & allied sciences
66
410 - Linguistics
60
670 - Manufacturing
59
720 - Architecture
58
800 - Literature & rhetoric
58
530 - Physics
56
414 - Phonology & phonetics
53
338 - Production
49
581 - Specific topics in natural history
46
651 - Office services
46
612 - Human physiology
44
170 - Ethics
40
336 - Public finance
40
791 - Public performances
37
158 - Applied psychology
36
301 - Sociology & anthropology
36
153 - Mental processes & intelligence
35
200 - Religion
30
150 - Psychology
25
361 - Social problems & social welfare in general
20
more ...