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Internet Guide
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Life sciences, biology (53/754)
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Physiology and related subjects (6/222)
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Biochemistry (56/500)
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Biochemistry in animals (9)
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Biochemistry in plants and microorganisms (19)
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General topics of biochemistry (29)
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Metabolism (20)
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Miscellaneous chemicals (12)
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Proteins (82)
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Enzymes (10)
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Biochemical genetics (68/303)
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Specific physiological systems in animals, regional histology and physiology in animals (3/87)
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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 (111/386)
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Natural history of organisms and related subjects (11/275)
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Adaptation (2)
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Miscellaneous nontaxonomic kinds of organisms (8/45)
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Organisms characteristic of specific kinds of environments (1/52)
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General topics in natural history of organisms (0/167)
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Natural history of specific kinds of organisms (0/2487)
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Microorganisms, fungi and algae (42/281)
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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 (41)
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Plants (Botany) (72/319)
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Specific topics in natural history of plants (2/407)
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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) (40/307)
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Specific topics in natural history of animals (4/229)
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Genetics, evolution, young of animals (5/25)
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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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Cryptogamia (Seedless plants) (2/42)
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Spermatophyta (Seed plants) (0/129)
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Specific taxonomic groups of animals (0/1111)
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Invertebrates (15/58)
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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 (13/535)
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Crustacea (29)
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Chelicerata, Arachnida (38)
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Myriapoda (4)
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Insecta (Insects) (120/458)
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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 (35)
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Coleoptera (Beetles) (52)
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Diptera (Flies) and Siphonaptera (54)
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Lepidoptera (69)
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Hymenoptera (50)
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Chordates (17/480)
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Cold-blooded vertebrates, Pisces (fishes) (13/96)
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Birds (87/174)
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Mammals (34/196)
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Economics of land and energy (5/412)
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Other subjects (0/488)
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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 (13)
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Earth Sciences (26)
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Paleontology, Paleozoology (28/42)
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Technology (10)
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Medicine and health (115)
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Agriculture and related technologies (35/134)
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Biotechnology (32)
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