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  1. Studies on the phenoldisulphonic acid method for determining nitrates in soils, by C.B. Lipman and L.T. Sharp.
    By: Lipman, Charles Bernard, - Sharp, Leslie Theodore,
    Publication info: Berkeley,University of California press[1912]
    Contributed by: Library of Congress
    Subjects: Analysis  Nitrates  Phenol sulphonic acid  Soils  
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  2. Studies on the phenoldisulphonic acid method for determining nitrates in soils,
    By: Davis, Charles Wesley.
    Publication info: Easton, Pa.,Eschenbach printing company,1917.
    Contributed by: Library of Congress
    Subjects: Analysis  Nitrates  Phenol sulphonic acid  Soils  
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