Classification
330 - Economics
80
332 - Financial economics
57
338 - Production
46
333 - Economics of land & energy
28
362 - Social welfare problems & services
16
363 - Other social problems & services
14
320 - Political science
9
340 - Law
6
300 - Social sciences
5
630 - Agriculture & related technologies
5
380 - Commerce, communications & transportation
4
307 - Communities
3
331 - Labor economics
3
350 - Public administration & military science
3
352 - General considerations of public administration
3
384 - Communications; telecommunication
3
551 - Geology, hydrology & meteorology
3
800 - Literature & rhetoric
3
303 - Social processes
2
304 - Factors affecting social behavior
2
339 - Macroeconomics & related topics
2
342 - Constitutional & administrative law
2
351 - Public administration
2
370 - Education
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
001 - Knowledge
1
016 - Bibliographies of works on specific subjects
1
030 - General encyclopedic works
1
200 - Religion
1
301 - Sociology & anthropology
1
336 - Public finance
1
343 - Military, tax, trade & industrial law
1
368 - Insurance
1
372 - Elementary education
1
379 - Public policy issues in education
1
382 - International commerce
1
385 - Railroad transportation
1
387 - Water, air & space transportation
1
388 - Transportation; ground transportation
1
410 - Linguistics
1
613 - Personal health & safety
1
614 - Incidence & prevention of disease
1
658 - General management
1
709 - Historical, geographic & persons treatment
1