Classification
616 - Diseases
264
610 - Medicine & health
134
618 - Gynecology, obstetrics, pediatrics & geriatrics
40
006 - Special computer methods
30
613 - Personal health & safety
30
617 - Surgery & related medical specialties
24
614 - Incidence & prevention of disease
20
612 - Human physiology
15
615 - Pharmacology & therapeutics
14
700 - The arts; fine & decorative arts
13
571 - Physiology & related subjects
11
140 - Specific philosophical schools
8
306 - Culture & institutions
7
333 - Economics of land & energy
6
570 - Life sciences; biology
6
580 - Plants (Botany)
6
600 - Technology
6
000 - Computer science, information & general works
5
330 - Economics
5
363 - Other social problems & services
5
380 - Commerce, communications & transportation
5
519 - Probabilities & applied mathematics
5
338 - Production
4
900 - History & geography
4
003 - Systems
3
170 - Ethics
3
304 - Factors affecting social behavior
3
370 - Education
3
551 - Geology, hydrology & meteorology
3
572 - Biochemistry
3
620 - Engineering & allied operations
3
658 - General management
3
004 - Data processing & computer science
2
057 - Serials in Slavic languages
2
061 - Organizations in North America
2
100 - Philosophy & psychology
2
155 - Differential & developmental psychology
2
174 - Occupational ethics
2
300 - Social sciences
2
509 - Historical, geographic & persons treatment
2
576 - Genetics & evolution
2
660 - Chemical engineering
2
691 - Building materials
2
001 - Knowledge
1
301 - Sociology & anthropology
1
302 - Social interaction
1
305 - Social groups
1
320 - Political science
1
340 - Law
1
353 - Specific fields of public administration
1
more ...