Classification
330 - Economics
380 - Commerce, communications & transportation
384 - Communications; telecommunication
539
658 - General management
464
333 - Economics of land & energy
226
000 - Computer science, information & general works
188
302 - Social interaction
182
363 - Other social problems & services
165
600 - Technology
155
300 - Social sciences
154
320 - Political science
146
700 - The arts; fine & decorative arts
143
808 - Rhetoric & collections of literature
112
900 - History & geography
106
500 - Natural sciences & mathematics
99
620 - Engineering & allied operations
83
610 - Medicine & health
79
381 - Commerce
75
331 - Labor economics
70
340 - Law
69
140 - Specific philosophical schools
66
650 - Management & auxiliary services
59
670 - Manufacturing
59
551 - Geology, hydrology & meteorology
47
370 - Education
46
651 - Office services
46
338 - Production
40
158 - Applied psychology
34
630 - Agriculture & related technologies
34
576 - Genetics & evolution
33
304 - Factors affecting social behavior
30
580 - Plants (Botany)
27
150 - Psychology
25
153 - Mental processes & intelligence
24
720 - Architecture
23
400 - Language
22
800 - Literature & rhetoric
21
006 - Special computer methods
15
100 - Philosophy & psychology
15
005 - Computer programming, programs & data
14
170 - Ethics
14
581 - Specific topics in natural history
14
410 - Linguistics
12
659 - Advertising & public relations
12
200 - Religion
11
530 - Physics
11
657 - Accounting
11
155 - Differential & developmental psychology
10
301 - Sociology & anthropology
10
414 - Phonology & phonetics
9
more ...