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1. Soluble aluminum studies: II. Minimum concentrations of aluminum found to be toxic to corn, sorghum, and barley in culture solutions.

2. Soluble aluminum studies: III. The Relationship of nitrification and sulfur oxidation to the aluminum and hydrogen-ion concentrtration of some very acid soils.

3. Soluble aluminum studies: IV. The Effects of phosphorus in reducing the detrimental effects of soil acidity on plant growth.

4. The Effect of mono-, di-, and tricalcium phosphates on the reaction of soils of different degrees of acidity.