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  1. 1
    The fixation of nitrogen in Colorado soils the distribution of the nitrates and their relation to the alkalis /

    The fixation of nitrogen in Colorado soils the distribution of the nitrates and their relation to the alkalis / by Headden, William P. (William Parker), 1850-1932

    Published 1913
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  2. 2
    The fixation of nitrogen in some Colorado soils

    The fixation of nitrogen in some Colorado soils by Headden, William P. (William Parker), 1850-1932

    Published 1910
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  3. 3
    Bacteriological studies of the fixation of nitrogen in certain Colorado soils

    Bacteriological studies of the fixation of nitrogen in certain Colorado soils by Sackett, Walter G. (Walter George), 1880-

    Published 1911
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  4. 4
    The fixation of nitrogen in some Colorado soils a further study /

    The fixation of nitrogen in some Colorado soils a further study / by Headden, William P. (William Parker), 1850-1932

    Published 1910
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  5. 5
    The role of nitrogen fixing bacteria in soil fertility /

    The role of nitrogen fixing bacteria in soil fertility / by Reusser, H. W.

    Published 1937
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