Classification
571 - Physiology & related subjects
487
580 - Plants (Botany)
284
630 - Agriculture & related technologies
112
581 - Specific topics in natural history
110
572 - Biochemistry
84
577 - Ecology
67
631 - Techniques, equipment & materials
52
660 - Chemical engineering
45
612 - Human physiology
35
634 - Orchards, fruits & forestry
32
579 - Microorganisms, fungi & algae
28
333 - Economics of land & energy
24
570 - Life sciences; biology
24
578 - Natural history of organisms
19
620 - Engineering & allied operations
15
551 - Geology, hydrology & meteorology
14
576 - Genetics & evolution
13
363 - Other social problems & services
12
330 - Economics
9
600 - Technology
9
000 - Computer science, information & general works
8
700 - The arts; fine & decorative arts
8
300 - Social sciences
7
001 - Knowledge
6
540 - Chemistry & allied sciences
6
610 - Medicine & health
6
616 - Diseases
5
900 - History & geography
4
140 - Specific philosophical schools
3
320 - Political science
3
380 - Commerce, communications & transportation
3
003 - Systems
2
005 - Computer programming, programs & data
2
304 - Factors affecting social behavior
2
370 - Education
2
547 - Organic chemistry
2
550 - Earth sciences
2
582 - Plants noted for characteristics & flowers
2
615 - Pharmacology & therapeutics
2
664 - Food technology
2
668 - Technology of other organic products
2
720 - Architecture
2
910 - Geography & travel
2
301 - Sociology & anthropology
1
338 - Production
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
509 - Historical, geographic & persons treatment
1
543 - Analytical chemistry
1
546 - Inorganic chemistry
1
more ...