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  1. 1
    A peculiar soil condition in the San Luis Valley

    A peculiar soil condition in the San Luis Valley by Headden, William P. (William Parker), 1850-1932

    Published 1923
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  2. 2
    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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  3. 3
    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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  4. 4
    A comparison of the soil-plaque method with the Neubauer and Hoffer Cornstalk methods for determining mineral soil deficiencies

    A comparison of the soil-plaque method with the Neubauer and Hoffer Cornstalk methods for determining mineral soil deficiencies

    Published 1932
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  5. 5
    Alfalfa

    Alfalfa by Headden, William P. (William Parker), 1850-1932

    Published 1896
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  6. 6
    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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  7. 7
    Nitrates in the soil an explanation of so-called "Black Alkali" or "Brown Spots" /

    Nitrates in the soil an explanation of so-called "Black Alkali" or "Brown Spots" / by Headden, William P. (William Parker), 1850-1932

    Published 1910
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  8. 8
    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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  9. 9
    Land types in eastern Colorado

    Land types in eastern Colorado

    Published 1944
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  10. 10
    The nitrate question in Colorado a review for the farmer /

    The nitrate question in Colorado a review for the farmer / by Headden, William P. (William Parker), 1850-1932

    Published 1925
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  11. 11
    Soils and alkali : fertility, irrigation, etc. /

    Soils and alkali : fertility, irrigation, etc. / by O'Brine, David, 1849-

    Published 1889
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  12. 12
    A soil study. sugar beets /

    A soil study. sugar beets / by Headden, William P. (William Parker), 1850-1932

    Published 1898
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  13. 13
    Soils and alkali fertility, irrigation, etc. /

    Soils and alkali fertility, irrigation, etc. / by O'Brine, David, 1849-

    Published 1889
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  14. 14
    A soil study.

    A soil study. by Headden, William P. (William Parker), 1850-1932

    Published 1901
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  15. 15
    Effects of clover and alfalfa in rotation.

    Effects of clover and alfalfa in rotation. by Headden, William P. (William Parker), 1850-1932

    Published 1930
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  16. 16
    Effects of clover and alfalfa : a comparison of legume culture with fallow culture.

    Effects of clover and alfalfa : a comparison of legume culture with fallow culture. by Headden, William P. (William Parker), 1850-1932

    Published 1930
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  17. 17
    Effects of clover and alfalfa in rotation.

    Effects of clover and alfalfa in rotation. by Headden, William P. (William Parker), 1850-1932

    Published 1930
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  18. 18
    A Comparison of the soil-plaque method with the Neubauer and Hoffer Cornstalk methods for determining mineral soil deficiences /

    A Comparison of the soil-plaque method with the Neubauer and Hoffer Cornstalk methods for determining mineral soil deficiences /

    Published 1932
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  19. 19
    A peculiar soil condition in the San Luis Valley /

    A peculiar soil condition in the San Luis Valley / by Headden, William P. (William Parker), 1850-1932

    Published 1923
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  20. 20
    Nitrates in the soil : an explanation of so-called "Black Alkali" or "Brown Spots" /

    Nitrates in the soil : an explanation of so-called "Black Alkali" or "Brown Spots" / by Headden, William P. (William Parker), 1850-1932

    Published 1910
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