Classification
571 - Physiology & related subjects
319
616 - Diseases
202
572 - Biochemistry
142
590 - Animals (Zoology)
38
580 - Plants (Botany)
27
615 - Pharmacology & therapeutics
25
576 - Genetics & evolution
23
612 - Human physiology
21
577 - Ecology
19
660 - Chemical engineering
15
592 - Invertebrates
13
570 - Life sciences; biology
11
636 - Animal husbandry
9
578 - Natural history of organisms
8
591 - Specific topics in natural history
8
613 - Personal health & safety
7
620 - Engineering & allied operations
7
560 - Paleontology; paleozoology
6
611 - Human anatomy, cytology & histology
6
617 - Surgery & related medical specialties
5
541 - Physical chemistry
4
579 - Microorganisms, fungi & algae
4
599 - Mammals
4
614 - Incidence & prevention of disease
4
540 - Chemistry & allied sciences
3
547 - Organic chemistry
3
596 - Chordates
3
610 - Medicine & health
3
618 - Gynecology, obstetrics, pediatrics & geriatrics
3
634 - Orchards, fruits & forestry
3
006 - Special computer methods
2
333 - Economics of land & energy
2
539 - Modern physics
2
595 - Arthropods
2
597 - Cold-blooded vertebrates; fishes
2
641 - Food & drink
2
664 - Food technology
2
363 - Other social problems & services
1
510 - Mathematics
1
519 - Probabilities & applied mathematics
1
531 - Classical mechanics; solid mechanics
1
543 - Analytical chemistry
1
551 - Geology, hydrology & meteorology
1
573 - Specific physiological systems in animals
1
631 - Techniques, equipment & materials
1
670 - Manufacturing
1
900 - History & geography
1