Classification
330 - Economics
8
551 - Geology, hydrology & meteorology
4
320 - Political science
3
340 - Law
3
577 - Ecology
3
910 - Geography & travel
3
304 - Factors affecting social behavior
2
333 - Economics of land & energy
2
370 - Education
2
550 - Earth sciences
2
616 - Diseases
2
650 - Management & auxiliary services
2
025 - Library operations
1
200 - Religion
1
301 - Sociology & anthropology
1
306 - Culture & institutions
1
331 - Labor economics
1
339 - Macroeconomics & related topics
1
410 - Linguistics
1
560 - Paleontology; paleozoology
1
571 - Physiology & related subjects
1
576 - Genetics & evolution
1
579 - Microorganisms, fungi & algae
1
592 - Invertebrates
1
613 - Personal health & safety
1
614 - Incidence & prevention of disease
1
620 - Engineering & allied operations
1
634 - Orchards, fruits & forestry
1
657 - Accounting
1
665 - Industrial oils, fats, waxes & gases
1