Ralph L. Willis

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Books

Analyses and Valuations of Commercial Fertilizers and Ground Bone ; Analyses of Agricultural Lime

Analyses and Valuations of Commercial Fertilizers and Ground Bone ; Analyses of Agricultural Lime

Charles Sanderson Cathcart, Benno Humbert Alfred Groth, Maurice Adin Blake, Ralph L. Willis, John Putnam Helyar

Analyses of Materials Sold as Insecticides and Fungicides During 1919

Analyses of Materials Sold as Insecticides and Fungicides During 1919

Charles Sanderson Cathcart, Ralph L. Willis

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