Classification
330 - Economics
39
658 - General management
25
005 - Computer programming, programs & data
24
004 - Data processing & computer science
22
006 - Special computer methods
17
616 - Diseases
14
621 - Applied physics
14
304 - Factors affecting social behavior
13
610 - Medicine & health
12
519 - Probabilities & applied mathematics
11
301 - Sociology & anthropology
8
300 - Social sciences
7
001 - Knowledge
6
306 - Culture & institutions
6
333 - Economics of land & energy
6
338 - Production
6
620 - Engineering & allied operations
6
910 - Geography & travel
5
320 - Political science
4
331 - Labor economics
4
510 - Mathematics
4
571 - Physiology & related subjects
4
577 - Ecology
4
670 - Manufacturing
4
003 - Systems
3
332 - Financial economics
3
364 - Criminology
3
371 - Schools & their activities; special education
3
500 - Natural sciences & mathematics
3
543 - Analytical chemistry
3
614 - Incidence & prevention of disease
3
650 - Management & auxiliary services
3
930 - History of ancient world to ca. 499
3
100 - Philosophy & psychology
2
305 - Social groups
2
361 - Social problems & social welfare in general
2
379 - Public policy issues in education
2
418 - Standard usage & applied linguistics
2
501 - Philosophy & theory
2
511 - General principles of mathematics
2
530 - Physics
2
547 - Organic chemistry
2
549 - Mineralogy
2
550 - Earth sciences
2
570 - Life sciences; biology
2
580 - Plants (Botany)
2
600 - Technology
2
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
629 - Other branches of engineering
2
657 - Accounting
2
more ...