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eRA Subjects
- Agriculture
  - Agriculture (General) (40)
    - Agricultural chemistry. Agricultural chemicals (7)
    - Agricultural conservation (10)
    - Agricultural ecology (General) (11)
    - Agricultural economics (7)
    - Agricultural education (9)
      - Agricultural extension work (2)
      - Exhibitions. Fairs (2)
      - Research. Experimentation (52)
    - Agricultural meteorology. Crops and climate (38)
    - Agriculture and the environment (20)
    - Conservation of natural resources (5)
    - Documents and other collections (2)
    - Farm economics. Farm management. Agricultural mathematics (9)
    - Farm machinery and farm engineering (1)
    - Fertilizers and improvement of the soil (20)
    - History (3)
    - Soil conservation and protection (6)
    - Soils. Soil science (48)
  - Animal culture (27)
    - Birds. Cage birds (9)
    - Brands and branding, and other means of identifying (1)
    - Breeding and breeds (24)
    - Cattle (74)
      - Dairy processing. Dairy products (5)
      - Dairying (7)
      - Meat production (13)
    - Cost, yield and profit. Accounting (4)
    - Equipment and supplies (1)
    - Feeds and feeding. Animal nutrition (63)
    - Goats (4)
    - Horses (6)
    - Housing and environmental control (6)
    - Insect rearing (2)
    - Laboratory animals (1)
    - Poultry. Eggs (18)
    - Rangelands. Range management. Grazing (27)
    - Reptiles (5)
    - Sheep (18)
      - Meat production (4)
      - Wool production (11)
    - Swine (60)
    - Transportation (3)
    - Veterinary medicine (49)
      - Communicable diseases of animals (General) (12)
      - Diseases of special classes of animals (28)
      - Other diseases and conditions (29)
      - Pathology (10)
      - Predatory animals and their control (6)
      - Toxicology (3)
      - Veterinary epidemiology. Epizootiology (8)
      - Veterinary medicine of special organs, regions and systems (1)
      - Veterinary microbiology, bacteriology, virology, mycology (65)
      - Veterinary parasitology (27)
    - Working animals (1)
  - Aquaculture. Fisheries (14)
    - Aquaculture (25)
      - By region or country (1)
      - Fish culture (8)
        Diseases and adverse factors (6)
      - Frogs, leeches, etc (1)
      - Mariculture (5)
    - Fisheries (22)
      - Algae culture (3)
      - By oceans and seas (4)
      - By region or country (15)
      - Economic aspects. Finance (1)
      - Exploratory fishing (1)
      - Fishery for individual species (36)
      - Fishery management. (12)
      - Fishery oceanography. Fishery meteorology (3)
      - Fishery Policy (2)
      - Fishery processing (7)
      - Fishery research (36)
      - Fishery resources. Fishery conservation (17)
      - Fishery Technology (2)
      - Methods and gear. Catching of fish (8)
      - Packing, transportation and storage (11)
      - Porpoises. Dolphins (2)
      - Safety measures (1)
      - Seagrasses (8)
      - Shellfish fisheries. Shellfish culture (14)
      - Sponge fisheries (1)
    - Seafood gathering (2)
  - Forestry (26)
    - Administration. Policy (2)
    - Conservation and protection (5)
    - Exploitation and utilization (1)
    - Forest meteorology. Forest microclimatology (1)
    - Forest roads (1)
    - Forest soils (3)
    - History of forestry. Forest conditions (2)
    - Sylviculture (9)
    - Tools and implements (1)
  - Plant culture (61)
    - Economic botany (1)
    - Field crops (80)
    - Flowers and flower culture. Ornamental plants (1)
    - Food crops (57)
    - Fruit and fruit culture (47)
      - Berries and small fruits (7)
      - Grape culture. Viticulture (2)
      - Nuts (8)
    - Growth regulators (5)
    - Harvesting, curing, storage (32)
    - History (2)
    - Horticulture. Horticultural crops (25)
    - Irrigation farming (6)
    - Methods for special areas (3)
    - Pests and diseases (120)
      - Economic entomology (3)
      - Individual or types of plants or trees (23)
      - Pest control and treatment of diseases. Plant protection (57)
        Inspection. Quarantine (6)
        Organic plant protection. Biological control (17)
        Pesticides (29)
      - Plant pathology (26)
      - Poisonous plants (2)
      - Weeds, parasitic plants etc (33)
    - Propagation (25)
    - Seeds. Seed technology (17)
    - Training and pruning (1)
    - Tree crops (11)
    - Vegetables (6)
- Bibliography. Library Science. Information Resources
  - Books. Writing. Paleography (3)
  - Information resources
    - Electronic information resources (2)
  - Libraries (General) (1)
  - Library Science. Information Science (1)
- Law
  - Law (General) (2)
- Science
  - Biology (11)
    - Biochemistry (14)
    - Cytology (1)
    - Ecology (5)
    - Genetics (97)
    - Molecular Biology (29)
    - Reproduction (21)
  - Botany (43)
    - Cryptogams (27)
    - General (1)
    - Plant anatomy (3)
    - Plant ecology (16)
    - Plant physiology (9)
    - Spermatophyte. Phanerogams
      - Angiosperms (1)
  - Entomology (46)
  - Invasive Species
    - Animals (4)
      - Animal control and ecology (6)
      - Impact assessment (2)
    - Modelling (1)
      - Animal (1)
      - Plant (7)
    - Plants (16)
      - Biological control (24)
      - Effect of herbicides (2)
      - Eradication and containment (7)
      - Integrated weed control (4)
      - Weed ecology (13)
  - Mathematics
    - Computer software (5)
  - Microbiology (15)
    - Bacteria (14)
    - Cyanobacteria (2)
    - General (1)
    - Immunology (7)
    - Microbial ecology (12)
    - Microorganisms in the animal body (4)
    - Virology (15)
  - Physiology (3)
    - Animal biochemistry (6)
    - Experimental pharmacology (1)
    - General (1)
    - Insect biochemistry (8)
  - Science (General) (70)
  - Statistics (17)
    - Experimental design (4)
    - Mathematical statistics (1)
    - Simulation modelling (40)
    - Statistical data analysis (24)
    - Statistical software (3)
  - Zoology (10)
    - Anatomy (1)
    - Animal behaviour (10)
    - Chordates. Vertebrates
      - Birds (2)
      - Fishes (4)
      - Mammals (5)
      - Reptiles and amphibians (4)
    - Invertebrates (2)
      - Insects (31)
    - Morphology (8)
- Technology
  - Technology (General) (37)
    - Spectroscopy (2)
      - HPLC (High Performance Liquid Chromatography) (1)
      - NIR (Near Infrared) (19)