Classification
330 - Economics
777
610 - Medicine & health
237
380 - Commerce, communications & transportation
120
570 - Life sciences; biology
70
616 - Diseases
32
614 - Incidence & prevention of disease
27
700 - The arts; fine & decorative arts
24
333 - Economics of land & energy
19
304 - Factors affecting social behavior
18
320 - Political science
18
000 - Computer science, information & general works
17
362 - Social welfare problems & services
16
613 - Personal health & safety
16
363 - Other social problems & services
15
370 - Education
15
576 - Genetics & evolution
11
580 - Plants (Botany)
10
140 - Specific philosophical schools
9
615 - Pharmacology & therapeutics
8
630 - Agriculture & related technologies
8
338 - Production
7
571 - Physiology & related subjects
7
612 - Human physiology
6
519 - Probabilities & applied mathematics
5
617 - Surgery & related medical specialties
5
900 - History & geography
5
100 - Philosophy & psychology
4
306 - Culture & institutions
4
340 - Law
4
600 - Technology
4
658 - General management
4
003 - Systems
3
361 - Social problems & social welfare in general
3
551 - Geology, hydrology & meteorology
3
620 - Engineering & allied operations
3
664 - Food technology
3
910 - Geography & travel
3
006 - Special computer methods
2
170 - Ethics
2
174 - Occupational ethics
2
300 - Social sciences
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
577 - Ecology
2
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
641 - Food & drink
2
001 - Knowledge
1
150 - Psychology
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
more ...