1-' Spraying Potatoes and Fruit-Trees', by C. R. Stocks , Parks Superintendent of Beckenham
2-' Surface Cultivations ', by Dr. B. A. Keen, D.Sc., F.R.S ., of Rothamsted Experimental Station
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1-' Spraying Potatoes and Fruit-Trees', by C. R. Stocks , Parks Superintendent of Beckenham
2-' Surface Cultivations ', by Dr. B. A. Keen, D.Sc., F.R.S ., of Rothamsted Experimental Station