Classification
617 - Surgery & related medical specialties
106
610 - Medicine & health
62
616 - Diseases
26
620 - Engineering & allied operations
9
600 - Technology
7
330 - Economics
6
580 - Plants (Botany)
6
000 - Computer science, information & general works
5
340 - Law
5
613 - Personal health & safety
5
700 - The arts; fine & decorative arts
5
370 - Education
4
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
570 - Life sciences; biology
3
612 - Human physiology
3
614 - Incidence & prevention of disease
3
900 - History & geography
3
304 - Factors affecting social behavior
2
414 - Phonology & phonetics
2
519 - Probabilities & applied mathematics
2
540 - Chemistry & allied sciences
2
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
658 - General management
2
820 - English & Old English literatures
2
003 - Systems
1
004 - Data processing & computer science
1
006 - Special computer methods
1
061 - Organizations in North America
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
150 - Psychology
1
170 - Ethics
1
174 - Occupational ethics
1
300 - Social sciences
1
320 - Political science
1
332 - Financial economics
1
338 - Production
1
339 - Macroeconomics & related topics
1
363 - Other social problems & services
1
512 - Algebra
1
520 - Astronomy & allied sciences
1
531 - Classical mechanics; solid mechanics
1
537 - Electricity & electronics
1
571 - Physiology & related subjects
1
615 - Pharmacology & therapeutics
1
660 - Chemical engineering
1