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Item Crop protection by wet spraying compared with crop protection by dusting(Tea Research Institute. Thalawakele, 1950) Lamb, J.Item Crop protection by copper fungicides Pt 2. copper residues in relation to quality(Tea Research Institute. Thalawakele, 1950) Lamb, J.Item Crop protection by wet spraying compared with crop protection by dusting in 1951(Tea Research Institute. Thalawakele, 1952) Lamb, J.