Classification
610 - Medicine & health
193
615 - Pharmacology & therapeutics
105
616 - Diseases
37
580 - Plants (Botany)
14
613 - Personal health & safety
11
620 - Engineering & allied operations
11
614 - Incidence & prevention of disease
8
571 - Physiology & related subjects
7
572 - Biochemistry
7
500 - Natural sciences & mathematics
6
374 - Adult education
5
612 - Human physiology
5
306 - Culture & institutions
4
519 - Probabilities & applied mathematics
4
617 - Surgery & related medical specialties
4
618 - Gynecology, obstetrics, pediatrics & geriatrics
4
000 - Computer science, information & general works
3
155 - Differential & developmental psychology
3
300 - Social sciences
3
301 - Sociology & anthropology
3
362 - Social welfare problems & services
3
384 - Communications; telecommunication
3
570 - Life sciences; biology
3
641 - Food & drink
3
658 - General management
3
664 - Food technology
3
700 - The arts; fine & decorative arts
3
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
501 - Philosophy & theory
2
600 - Technology
2
001 - Knowledge
1
006 - Special computer methods
1
128 - Humankind
1
142 - Critical philosophy
1
150 - Psychology
1
303 - Social processes
1
305 - Social groups
1
330 - Economics
1
331 - Labor economics
1
368 - Insurance
1
370 - Education
1
398 - Folklore
1
551 - Geology, hydrology & meteorology
1
578 - Natural history of organisms
1
579 - Microorganisms, fungi & algae
1
581 - Specific topics in natural history
1
624 - Civil engineering
1
629 - Other branches of engineering
1
630 - Agriculture & related technologies
1
more ...