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  1.  Life sciences, biology (60/791)
  2.  Physiology and related subjects (9/252)
  3.  Biochemistry (66/523)
    1.  Biochemistry in animals (9)
    2.  Biochemistry in plants and microorganisms (24)
    3.  General topics of biochemistry (29)
    4.  Metabolism (21)
    5.  Miscellaneous chemicals (13)
    6.  Proteins (82)
    7.  Enzymes (10)
    8.  Biochemical genetics (71/309)
      1.  Biochemical genetics in animals (34)
      2.  Biochemical genetics in plants and microorganisms (45)
      3.  General topics in biochemical genetics (38)
      4.  Metabolism in biochemical genetics (4)
      5.  Nucleotides (1)
      6.  DNA (Desoxyribonucleic acid) (104)
      7.  Chromosomes (4)
      8.  RNA (Ribonucleic acid) (31)
  4.  Specific physiological systems in animals, regional histology and physiology in animals (4/100)
  5.  Specific parts of and physiological systems in plants (2/25)
  6.  Genetics and evolution (11/147)
  7.  Ecology (134/434)
  8.  Natural history of organisms and related subjects (12/283)
    1.  Adaptation (2)
    2.  Miscellaneous nontaxonomic kinds of organisms (8/49)
    3.  Organisms characteristic of specific kinds of environments (1/54)
    4.  General topics in natural history of organisms (0/169)
  9.  Natural history of specific kinds of organisms (0/2634)
    1.  Microorganisms, fungi and algae (49/307)
      1.  Specific topics in natural history of microorganisms, fungi, algae (33)
      2.  Viruses and subviral organisms (15)
      3.  Prokaryotes (Bacteria) (32)
      4.  Protozoa (18)
      5.  Fungi, Eumycophyta (True fungi) (99)
      6.  Mushrooms (16)
      7.  Lichens (24)
      8.  Algae (44)
    2.  Plants (Botany) (75/331)
    3.  Specific topics in natural history of plants (2/418)
      1.  Plant genetics and evolution (8/21)
      2.  Adaptation (5)
      3.  Miscellaneous nontaxonomic kinds of plants (11/82)
      4.  Plants characteristic of specific environments, plant ecology (16/63)
        1.  Forest plants (5)
        2.  Grassland plants (6)
        3.  Plants of miscellaneous environments (10)
        4.  Aquatic plants (10)
        5.  Synecology and population biology of plants (6/17)
      5.  Treatments of plants by specific continents, countries, localities (260)
    4.  Plants noted for specific vegetative characteristics and flowers (3/60)
      1.  Herbaceous and woody plants, plants noted for their flowers (3/57)
        1.  Plants noted for their flowers (16)
        2.  Trees (37)
        3.  Shrubs (7)
        4.  Vines (2)
    5.  Animals (Zoology) (41/323)
    6.  Specific topics in natural history of animals (4/247)
    7.  Specific taxonomic groups of plants (0/172)
    8.  Specific taxonomic groups of animals (0/1181)
      1.  Invertebrates (15/63)
      2.  Miscellaneous marine and seashore invertebrates (2/17)
        1.  Cnidaria (Coelenterata) (5)
        2.  Anthozoa (7)
        3.  Ctenophora (Comb jellies) (1)
        4.  Echinodermata and Hemichordata (3)
      3.  Mollusks and molluscoids (16/31)
      4.  Arthropods (13/560)
        1.  Crustacea (31)
        2.  Chelicerata, Arachnida (40)
        3.  Myriapoda (4)
        4.  Insecta (Insects) (131/479)
          1.  General topics in natural history of insects (15)
          2.  Apterygota, Orthoptera and related orders (28)
          3.  Exopterygota (Hemimetabola) (33)
          4.  Mecoptera, Trichoptera, Neuroptera, Megaloptera, Raphidiodea (11)
          5.  Homoptera, Heteroptera, Anoplura, Mallophaga, Thysanoptera (35)
          6.  Coleoptera (Beetles) (54)
          7.  Diptera (Flies) and Siphonaptera (57)
          8.  Lepidoptera (71)
          9.  Hymenoptera (51)
      5.  Chordates (17/519)
        1.  Cold-blooded vertebrates, Pisces (fishes) (13/100)
        2.  Birds (103/193)
        3.  Mammals (36/212)
  10.  Economics of land and energy (5/425)
    1.  Natural resources and energy (20/181)
      1.  Conservation and protection (127/162)
    2.  Other natural resources (1/226)
      1.  Water (7/11)
      2.  Biological resources (118/215)
    3.  Environmental problems (28/40)
  11.  Other subjects (0/511)
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