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Internet Guide
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Life sciences, biology (55/763)
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Physiology and related subjects (6/223)
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Biochemistry (56/501)
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Specific physiological systems in animals, regional histology and physiology in animals (3/89)
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Circulatory system (5)
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Digestive system (1)
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Endocrine and excretory systems (6)
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Integument (1)
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Reproductive system of animals (3)
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Musculoskeletal system (4)
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Nervous and sensory system (66)
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Specific parts of and physiological systems in plants (2/22)
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Genetics and evolution (11/140)
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Ecology (107/384)
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Natural history of organisms and related subjects (12/278)
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Natural history of specific kinds of organisms (0/2488)
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Microorganisms, fungi and algae (43/284)
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Specific topics in natural history of microorganisms, fungi, algae (31)
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Viruses and subviral organisms (15)
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Prokaryotes (Bacteria) (31)
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Protozoa (18)
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Fungi, Eumycophyta (True fungi) (86)
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Mushrooms (14)
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Lichens (24)
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Algae (43)
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Plants (Botany) (72/322)
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Specific topics in natural history of plants (2/406)
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Plants noted for specific vegetative characteristics and flowers (3/60)
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Herbaceous and woody plants, plants noted for their flowers (3/57)
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Plants noted for their flowers (16)
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Trees (37)
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Shrubs (7)
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Vines (2)
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Animals (Zoology) (40/306)
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Specific topics in natural history of animals (4/230)
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Genetics, evolution, young of animals (5/26)
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Behavior (94)
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Miscellaneous nontaxonomic kinds of animals (10/40)
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Animals characteristic of specific environments, animal ecology (2/42)
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Treatments of animals by specific continents, countries, localities (32)
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Specific taxonomic groups of plants (0/171)
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Specific taxonomic groups of animals (0/1109)
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Invertebrates (14/56)
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Miscellaneous marine and seashore invertebrates (2/17)
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Cnidaria (Coelenterata) (5)
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Anthozoa (7)
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Ctenophora (Comb jellies) (1)
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Echinodermata and Hemichordata (3)
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Mollusks and molluscoids (15/30)
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Arthropods (13/534)
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Crustacea (28)
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Chelicerata, Arachnida (37)
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Myriapoda (4)
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Insecta (Insects) (121/459)
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General topics in natural history of insects (14)
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Apterygota, Orthoptera and related orders (27)
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Exopterygota (Hemimetabola) (33)
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Mecoptera, Trichoptera, Neuroptera, Megaloptera, Raphidiodea (11)
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Homoptera, Heteroptera, Anoplura, Mallophaga, Thysanoptera (34)
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Coleoptera (Beetles) (52)
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Diptera (Flies) and Siphonaptera (55)
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Lepidoptera (69)
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Hymenoptera (50)
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Chordates (17/481)
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Cold-blooded vertebrates, Pisces (fishes) (13/96)
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Birds (88/175)
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Mammals (34/196)
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Economics of land and energy (5/410)
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Other subjects (0/487)
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Bibliography (105)
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Political sciences (Politics and government) (7)
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Law (5)
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Natural history (38)
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Physics (2)
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Chemistry and allied sciences (14)
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Earth Sciences (26)
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Paleontology, Paleozoology (28/42)
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Paleobotany, fossil microorganisms (8)
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Reptilia (7)
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Technology (10)
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Medicine and health (115)
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Agriculture and related technologies (35/133)
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Biotechnology (32)
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