Classification
330 - Economics
300 - Social sciences
174
658 - General management
152
333 - Economics of land & energy
87
363 - Other social problems & services
85
380 - Commerce, communications & transportation
80
700 - The arts; fine & decorative arts
79
320 - Political science
77
000 - Computer science, information & general works
68
302 - Social interaction
68
600 - Technology
66
610 - Medicine & health
53
620 - Engineering & allied operations
50
384 - Communications; telecommunication
47
500 - Natural sciences & mathematics
44
630 - Agriculture & related technologies
41
338 - Production
33
900 - History & geography
33
580 - Plants (Botany)
32
140 - Specific philosophical schools
31
370 - Education
28
670 - Manufacturing
28
331 - Labor economics
25
551 - Geology, hydrology & meteorology
21
340 - Law
16
332 - Financial economics
14
381 - Commerce
14
650 - Management & auxiliary services
14
170 - Ethics
11
158 - Applied psychology
10
581 - Specific topics in natural history
10
800 - Literature & rhetoric
10
100 - Philosophy & psychology
9
540 - Chemistry & allied sciences
9
361 - Social problems & social welfare in general
8
576 - Genetics & evolution
8
362 - Social welfare problems & services
7
657 - Accounting
7
720 - Architecture
7
001 - Knowledge
5
150 - Psychology
5
153 - Mental processes & intelligence
5
200 - Religion
5
303 - Social processes
3
304 - Factors affecting social behavior
3
659 - Advertising & public relations
3
004 - Data processing & computer science
2
006 - Special computer methods
2
155 - Differential & developmental psychology
2
297 - Islam, Babism & Bahai Faith
2
more ...