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Authors

Author

John Putnam Helyar

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

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