Classification
330 - Economics
96
320 - Political science
42
600 - Technology
37
333 - Economics of land & energy
31
370 - Education
29
304 - Factors affecting social behavior
26
658 - General management
24
338 - Production
22
610 - Medicine & health
15
363 - Other social problems & services
14
306 - Culture & institutions
12
300 - Social sciences
10
500 - Natural sciences & mathematics
9
900 - History & geography
8
006 - Special computer methods
7
301 - Sociology & anthropology
7
000 - Computer science, information & general works
6
340 - Law
6
380 - Commerce, communications & transportation
6
621 - Applied physics
6
700 - The arts; fine & decorative arts
6
140 - Specific philosophical schools
5
303 - Social processes
5
327 - International relations
5
331 - Labor economics
5
302 - Social interaction
4
620 - Engineering & allied operations
4
004 - Data processing & computer science
3
005 - Computer programming, programs & data
3
305 - Social groups
3
307 - Communities
3
336 - Public finance
3
337 - International economics
3
378 - Higher education
3
650 - Management & auxiliary services
3
025 - Library operations
2
100 - Philosophy & psychology
2
332 - Financial economics
2
361 - Social problems & social welfare in general
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
577 - Ecology
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
630 - Agriculture & related technologies
2
657 - Accounting
2
670 - Manufacturing
2
938 - Greece to 323
2
more ...