Classification
380 - Commerce, communications & transportation
330 - Economics
1,196
600 - Technology
705
384 - Communications; telecommunication
679
333 - Economics of land & energy
651
658 - General management
632
000 - Computer science, information & general works
611
700 - The arts; fine & decorative arts
606
610 - Medicine & health
531
620 - Engineering & allied operations
475
900 - History & geography
467
363 - Other social problems & services
456
320 - Political science
356
300 - Social sciences
295
302 - Social interaction
243
140 - Specific philosophical schools
242
500 - Natural sciences & mathematics
195
370 - Education
161
580 - Plants (Botany)
140
340 - Law
133
576 - Genetics & evolution
131
630 - Agriculture & related technologies
121
551 - Geology, hydrology & meteorology
120
808 - Rhetoric & collections of literature
117
400 - Language
109
331 - Labor economics
90
304 - Factors affecting social behavior
85
100 - Philosophy & psychology
81
381 - Commerce
78
540 - Chemistry & allied sciences
73
650 - Management & auxiliary services
70
800 - Literature & rhetoric
64
720 - Architecture
63
410 - Linguistics
62
670 - Manufacturing
60
530 - Physics
58
414 - Phonology & phonetics
54
338 - Production
52
651 - Office services
48
581 - Specific topics in natural history
46
612 - Human physiology
43
170 - Ethics
42
301 - Sociology & anthropology
42
158 - Applied psychology
40
336 - Public finance
40
153 - Mental processes & intelligence
35
200 - Religion
30
150 - Psychology
28
615 - Pharmacology & therapeutics
20
361 - Social problems & social welfare in general
19
more ...