Classification
380 - Commerce, communications & transportation
330 - Economics
1,376
600 - Technology
728
333 - Economics of land & energy
718
384 - Communications; telecommunication
700
658 - General management
667
700 - The arts; fine & decorative arts
645
000 - Computer science, information & general works
620
610 - Medicine & health
543
363 - Other social problems & services
512
900 - History & geography
511
620 - Engineering & allied operations
499
320 - Political science
430
300 - Social sciences
311
302 - Social interaction
271
140 - Specific philosophical schools
255
370 - Education
212
500 - Natural sciences & mathematics
195
340 - Law
153
630 - Agriculture & related technologies
143
400 - Language
141
576 - Genetics & evolution
139
580 - Plants (Botany)
139
551 - Geology, hydrology & meteorology
125
808 - Rhetoric & collections of literature
117
304 - Factors affecting social behavior
109
100 - Philosophy & psychology
104
410 - Linguistics
98
331 - Labor economics
88
670 - Manufacturing
81
381 - Commerce
80
800 - Literature & rhetoric
77
650 - Management & auxiliary services
70
540 - Chemistry & allied sciences
68
720 - Architecture
67
530 - Physics
64
336 - Public finance
63
414 - Phonology & phonetics
60
338 - Production
51
581 - Specific topics in natural history
50
651 - Office services
47
301 - Sociology & anthropology
45
170 - Ethics
44
612 - Human physiology
44
791 - Public performances
41
153 - Mental processes & intelligence
38
158 - Applied psychology
36
200 - Religion
33
150 - Psychology
25
780 - Music
23
more ...