Classification
610 - Medicine & health
61
616 - Diseases
37
330 - Economics
29
613 - Personal health & safety
14
614 - Incidence & prevention of disease
11
004 - Data processing & computer science
10
005 - Computer programming, programs & data
10
617 - Surgery & related medical specialties
7
658 - General management
7
006 - Special computer methods
5
304 - Factors affecting social behavior
5
306 - Culture & institutions
4
618 - Gynecology, obstetrics, pediatrics & geriatrics
4
003 - Systems
3
140 - Specific philosophical schools
3
300 - Social sciences
3
500 - Natural sciences & mathematics
3
600 - Technology
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
170 - Ethics
2
302 - Social interaction
2
338 - Production
2
353 - Specific fields of public administration
2
612 - Human physiology
2
615 - Pharmacology & therapeutics
2
621 - Applied physics
2
670 - Manufacturing
2
057 - Serials in Slavic languages
1
061 - Organizations in North America
1
153 - Mental processes & intelligence
1
155 - Differential & developmental psychology
1
305 - Social groups
1
320 - Political science
1
331 - Labor economics
1
332 - Financial economics
1
333 - Economics of land & energy
1
344 - Labor, social, education & cultural law
1
362 - Social welfare problems & services
1
364 - Criminology
1
370 - Education
1
374 - Adult education
1
381 - Commerce
1
418 - Standard usage & applied linguistics
1
518 - Numerical analysis
1
519 - Probabilities & applied mathematics
1
580 - Plants (Botany)
1
745 - Decorative arts
1