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52. Breazeale, J. F., " The Relation of Sodium to Potassium in Soil and Solution 



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60. Brown, Horace T., and Escombe, F., " Researches on Some of the Physiological 



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63. Brown, Percy E., " Bacteriological Studies of Field Soils," Centr. Bakt. Par., 



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66. Cameron, Frank K., and Breazeale, J. F., " The Organic Matter in Soils and 



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67. Cameron, Frank K., and Patten, H. E., " The Distribution of Solute between 



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68. Cameron, Frank K!, "The Soil Solution, or the Nutrient Medium for Plant 



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