Classification
576 - Genetics & evolution
401
570 - Life sciences; biology
126
577 - Ecology
97
571 - Physiology & related subjects
75
590 - Animals (Zoology)
50
592 - Invertebrates
37
616 - Diseases
31
572 - Biochemistry
29
579 - Microorganisms, fungi & algae
29
333 - Economics of land & energy
28
560 - Paleontology; paleozoology
28
612 - Human physiology
27
580 - Plants (Botany)
20
301 - Sociology & anthropology
18
581 - Specific topics in natural history
16
006 - Special computer methods
15
591 - Specific topics in natural history
15
004 - Data processing & computer science
14
634 - Orchards, fruits & forestry
12
610 - Medicine & health
11
530 - Physics
10
551 - Geology, hydrology & meteorology
9
501 - Philosophy & theory
7
910 - Geography & travel
7
500 - Natural sciences & mathematics
6
636 - Animal husbandry
6
930 - History of ancient world to ca. 499
6
231 - God
5
330 - Economics
5
547 - Organic chemistry
5
550 - Earth sciences
5
578 - Natural history of organisms
5
620 - Engineering & allied operations
5
630 - Agriculture & related technologies
5
150 - Psychology
4
519 - Probabilities & applied mathematics
4
520 - Astronomy & allied sciences
4
596 - Chordates
4
900 - History & geography
4
155 - Differential & developmental psychology
3
306 - Culture & institutions
3
515 - Analysis
3
523 - Specific celestial bodies & phenomena
3
003 - Systems
2
120 - Epistemology, causation & humankind
2
200 - Religion
2
363 - Other social problems & services
2
509 - Historical, geographic & persons treatment
2
541 - Physical chemistry
2
573 - Specific physiological systems in animals
2
more ...