Classification
616 - Diseases
626
617 - Surgery & related medical specialties
208
610 - Medicine & health
89
618 - Gynecology, obstetrics, pediatrics & geriatrics
31
615 - Pharmacology & therapeutics
21
362 - Social welfare problems & services
18
612 - Human physiology
8
614 - Incidence & prevention of disease
8
338 - Production
4
613 - Personal health & safety
4
700 - The arts; fine & decorative arts
3
320 - Political science
2
330 - Economics
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
150 - Psychology
1
158 - Applied psychology
1
170 - Ethics
1
333 - Economics of land & energy
1
344 - Labor, social, education & cultural law
1
353 - Specific fields of public administration
1
358 - Air & other specialized forces
1
363 - Other social problems & services
1
364 - Criminology
1
381 - Commerce
1
410 - Linguistics
1
418 - Standard usage & applied linguistics
1
600 - Technology
1
628 - Sanitary & municipal engineering
1
636 - Animal husbandry
1
658 - General management
1