Classification
616 - Diseases
337
617 - Surgery & related medical specialties
124
006 - Special computer methods
24
610 - Medicine & health
19
618 - Gynecology, obstetrics, pediatrics & geriatrics
18
615 - Pharmacology & therapeutics
11
614 - Incidence & prevention of disease
7
612 - Human physiology
6
613 - Personal health & safety
4
061 - Organizations in North America
3
620 - Engineering & allied operations
3
362 - Social welfare problems & services
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
003 - Systems
1
364 - Criminology
1
628 - Sanitary & municipal engineering
1