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Agricultural Laboratories -- United States (1)
Agricultural Laboratories United States (1)
Agricultural Wastes -- Research -- United States (2)
Agricultural Wastes Research United States (2)
Apples -- Research -- United States (1)
Apples Research United States (1)
Association Of Official Agricultural Chemists (U.S.) (1)
Association Of Official Agricultural Chemists (US) (1)
Barns -- Fires And Fire Prevention -- Research (1)
Barns Fires And Fire Prevention Research (1)
Canned Foods Industry -- Research -- United States (1)
Canned Foods Industry Research United States (1)
Canning And Preserving (1)
Chemistry, Analytic -- Standardization (1)
Chemistry, Analytic Standardization (1)
Citrus Fruit Industry (1)
Citrus Fruit Industry -- Research -- United States (1)
Citrus Fruit Industry Research United States (1)
Combustion, Spontaneous (3)
Cotton Growing -- Research -- United States (1)
Cotton Growing Research United States (1)
Dust Explosions (1)
Dust Explosions -- Prevention -- Research (1)
Dust Explosions Prevention Research (1)
Dust Storms -- United States (1)
Dust Storms United States (1)
Farm Produce (1)
Farms -- Fires And Fire Prevention -- United States (2)
Farms Fires And Fire Prevention United States (2)
Fertilizer Industry (1)
Fertilizers (9)
Fertilizers -- Research -- United States (1)
Fertilizers Research United States (1)
Fires (1)
Food -- Mineral Content (1)
Food Mineral Content (1)

Gardening -- Fertilizers (2)
Gardening Fertilizers (2)
Hay (2)
Hay -- Research -- United States (1)
Hay Research United States (1)
Honey -- Marketing (1)
Honey -- Nutrition (1)
Honey -- Research -- United States (3)
Honey Marketing (1)
Honey Nutrition (1)
Honey Research United States (3)
House Plants -- Fertilizers (1)
House Plants Fertilizers (1)
Insect Pests -- Control -- Research -- United States (1)
Insect Pests Control Research United States (1)
Land Use -- United States -- Classification (1)
Land Use United States Classification (1)
Leather Industry And Trade -- Materials -- Research (1)
Leather Industry And Trade Materials Research (1)
Lightning Protection (1)
Lightning Rods (1)
Liming Of Soils -- United States (1)
Liming Of Soils United States (1)
Minerals In Nutrition (1)
National Farm And Home Hour (Radio Program) (40)
Naval Stores -- Research -- United States (1)
Naval Stores Research United States (1)
Nitrogen -- Fixation -- United States (1)
Nitrogen Fertilizers (1)
Nitrogen Fixation United States (1)
Pests -- Control -- Patents -- Bibliography (47)
Potatoes (1)
Radio Addresses, Debates, Etc. -- United States (64)
Radio Addresses, Debates, Etc United States (64)
Radio Programs -- United States (64)
Radio Programs United States (64)

Salting Of Food (1)
Soil Conservation -- Research -- United States (1)
Soil Conservation -- United States (2)
Soil Conservation Research United States (1)
Soil Conservation United States (2)
Soil Erosion -- Government Policy -- United States (1)
Soil Erosion -- United States (4)
Soil Erosion Government Policy United States (1)
Soil Erosion United States (4)
Soil Fertility (1)
Soil Fertility -- Research (2)
Soil Fertility -- Research -- United States (2)
Soil Fertility Research (2)
Soil Fertility Research United States (2)
Soil Microbiology (1)
Soil Microbiology -- Research -- United States (1)
Soil Microbiology Research United States (1)
Soils -- Composition (3)
Soils -- Composition -- Evaluation (1)
Soils -- Composition -- Research -- United States (1)
Soils Composition (3)
Soils Composition Evaluation (1)
Soils Composition Research United States (1)
Sweet Potatoes -- Research -- United States (1)
Sweet Potatoes Research United States (1)
Syrups -- Research -- United States (1)
Syrups Research United States (1)
United States. Bureau Of Chemistry And Soils (2)
United States. Bureau Of Chemistry And Soils -- Research (22)
United States. Department Of Agriculture (1)
United States Bureau Of Chemistry And Soils (2)
United States Bureau Of Chemistry And Soils Research (22)
United States Department Of Agriculture (1)
Wheat -- Research -- United States (1)
Wheat Research United States (1)