Classification
330 - Economics
98
320 - Political science
76
630 - Agriculture & related technologies
68
340 - Law
27
300 - Social sciences
19
333 - Economics of land & energy
16
577 - Ecology
9
631 - Techniques, equipment & materials
9
338 - Production
8
304 - Factors affecting social behavior
7
580 - Plants (Botany)
7
641 - Food & drink
7
664 - Food technology
7
551 - Geology, hydrology & meteorology
6
658 - General management
5
820 - English & Old English literatures
5
001 - Knowledge
4
006 - Special computer methods
4
570 - Life sciences; biology
4
005 - Computer programming, programs & data
3
301 - Sociology & anthropology
3
331 - Labor economics
3
363 - Other social problems & services
3
571 - Physiology & related subjects
3
592 - Invertebrates
3
610 - Medicine & health
3
700 - The arts; fine & decorative arts
3
910 - Geography & travel
3
000 - Computer science, information & general works
2
004 - Data processing & computer science
2
380 - Commerce, communications & transportation
2
530 - Physics
2
550 - Earth sciences
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
634 - Orchards, fruits & forestry
2
900 - History & geography
2
003 - Systems
1
050 - General serial publications
1
230 - Christianity & Christian theology
1
303 - Social processes
1
305 - Social groups
1
306 - Culture & institutions
1
327 - International relations
1
332 - Financial economics
1
337 - International economics
1
339 - Macroeconomics & related topics
1
344 - Labor, social, education & cultural law
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
more ...