Classification
330 - Economics
122
300 - Social sciences
114
658 - General management
109
302 - Social interaction
103
577 - Ecology
52
338 - Production
51
333 - Economics of land & energy
27
000 - Computer science, information & general works
19
500 - Natural sciences & mathematics
19
670 - Manufacturing
18
331 - Labor economics
12
650 - Management & auxiliary services
11
600 - Technology
10
621 - Applied physics
10
550 - Earth sciences
7
320 - Political science
6
551 - Geology, hydrology & meteorology
6
700 - The arts; fine & decorative arts
6
158 - Applied psychology
5
363 - Other social problems & services
5
620 - Engineering & allied operations
5
153 - Mental processes & intelligence
4
610 - Medicine & health
4
370 - Education
3
384 - Communications; telecommunication
3
630 - Agriculture & related technologies
3
001 - Knowledge
2
100 - Philosophy & psychology
2
150 - Psychology
2
303 - Social processes
2
304 - Factors affecting social behavior
2
340 - Law
2
350 - Public administration & military science
2
553 - Economic geology
2
628 - Sanitary & municipal engineering
2
657 - Accounting
2
660 - Chemical engineering
2
690 - Buildings
2
900 - History & geography
2
004 - Data processing & computer science
1
025 - Library operations
1
140 - Specific philosophical schools
1
155 - Differential & developmental psychology
1
332 - Financial economics
1
344 - Labor, social, education & cultural law
1
361 - Social problems & social welfare in general
1
362 - Social welfare problems & services
1
368 - Insurance
1
380 - Commerce, communications & transportation
1
388 - Transportation; ground transportation
1
more ...