Classification
592 - Invertebrates
150
577 - Ecology
24
610 - Medicine & health
22
580 - Plants (Botany)
18
333 - Economics of land & energy
17
571 - Physiology & related subjects
17
630 - Agriculture & related technologies
16
590 - Animals (Zoology)
13
700 - The arts; fine & decorative arts
13
000 - Computer science, information & general works
12
576 - Genetics & evolution
12
363 - Other social problems & services
11
570 - Life sciences; biology
10
581 - Specific topics in natural history
8
600 - Technology
6
620 - Engineering & allied operations
6
330 - Economics
5
551 - Geology, hydrology & meteorology
5
634 - Orchards, fruits & forestry
5
140 - Specific philosophical schools
4
591 - Specific topics in natural history
4
595 - Arthropods
4
612 - Human physiology
4
003 - Systems
3
380 - Commerce, communications & transportation
3
500 - Natural sciences & mathematics
3
560 - Paleontology; paleozoology
3
572 - Biochemistry
3
615 - Pharmacology & therapeutics
3
320 - Political science
2
414 - Phonology & phonetics
2
540 - Chemistry & allied sciences
2
616 - Diseases
2
631 - Techniques, equipment & materials
2
632 - Plant injuries, diseases & pests
2
660 - Chemical engineering
2
800 - Literature & rhetoric
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
400 - Language
1
550 - Earth sciences
1
573 - Specific physiological systems in animals
1
578 - Natural history of organisms
1
579 - Microorganisms, fungi & algae
1
635 - Garden crops (Horticulture)
1
641 - Food & drink
1
658 - General management
1
664 - Food technology
1
900 - History & geography
1
more ...