Classification
330 - Economics
380 - Commerce, communications & transportation
384 - Communications; telecommunication
562
658 - General management
484
333 - Economics of land & energy
226
000 - Computer science, information & general works
188
302 - Social interaction
185
363 - Other social problems & services
165
300 - Social sciences
159
600 - Technology
155
320 - Political science
146
700 - The arts; fine & decorative arts
144
808 - Rhetoric & collections of literature
113
900 - History & geography
106
500 - Natural sciences & mathematics
99
620 - Engineering & allied operations
84
610 - Medicine & health
81
381 - Commerce
76
331 - Labor economics
71
340 - Law
69
140 - Specific philosophical schools
66
650 - Management & auxiliary services
60
670 - Manufacturing
59
651 - Office services
48
551 - Geology, hydrology & meteorology
47
370 - Education
46
338 - Production
43
158 - Applied psychology
37
630 - Agriculture & related technologies
34
576 - Genetics & evolution
33
304 - Factors affecting social behavior
30
150 - Psychology
28
580 - Plants (Botany)
27
153 - Mental processes & intelligence
24
720 - Architecture
23
400 - Language
22
800 - Literature & rhetoric
21
005 - Computer programming, programs & data
15
100 - Philosophy & psychology
15
006 - Special computer methods
14
170 - Ethics
14
581 - Specific topics in natural history
14
659 - Advertising & public relations
13
410 - Linguistics
12
155 - Differential & developmental psychology
11
200 - Religion
11
530 - Physics
11
657 - Accounting
11
301 - Sociology & anthropology
10
303 - Social processes
9
more ...