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Beetles -- North America -- Classification. (11)
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Beetles -- North America -- Geographical distribution. (6)
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Beetles -- Canada -- Classification. (4)
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Beetles -- United States -- Classification. (4)
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Cotton gins and ginning -- Handbooks, manuals, etc. (3)
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Insecticides. (3)
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Bee culture -- United States. (2)
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Curculionidae. (2)
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Fruit -- Diseases and pests. (2)
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Insect pests -- Control -- Handbooks, manuals, etc. (2)
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Insect pests -- Control. (2)
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Pesticides -- Handbooks, manuals, etc. (2)
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Potatoes -- Diseases and pests. (2)
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Vegetables -- Diseases and pests. (2)
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Accidents -- Prevention -- Handbooks, manuals, etc. (1)
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Aerial spraying and dusting in agriculture -- Equipment and supplies -- Handbooks, manuals, etc. (1)
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Agricultural colleges -- United States -- Directories. (1)
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Agricultural colleges -- United States -- Faculty -- Directories. (1)
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Agricultural experiment stations -- United States -- Directories. (1)
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Agricultural experiment stations -- United States -- Employees -- Directories. (1)
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