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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
    Soil morphology and classification ; Classifying the soils within a soil survey area in the high plains ; Soils of eastern Colorado /

    Soil morphology and classification ; Classifying the soils within a soil survey area in the high plains ; Soils of eastern Colorado / by Brown, L. A. (Lindsey Andrew) 1906-

    Published 1938
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  12. 12
    Soil survey of Huerfano County area, Colorado

    Soil survey of Huerfano County area, Colorado

    Published 1983
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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
    Report of investigations on potato fertilizer and chemical soil treatments in 1942, Fruita district, in cooperation with the Mesa County Research Committee

    Report of investigations on potato fertilizer and chemical soil treatments in 1942, Fruita district, in cooperation with the Mesa County Research Committee by McLean, John G. (John Grim), 1913-

    Published 1942
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  15. 15
    Preliminary report on the soils of Colorado, 1939-1940 /

    Preliminary report on the soils of Colorado, 1939-1940 / by Brown, L. A. (Lindsey Andrew), 1906-

    Published 1937
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  16. 16
    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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  17. 17
    Slick spots in western Colorado soils

    Slick spots in western Colorado soils by Gardner, Robert Alexander

    Published 1937
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  18. 18
    Nitric nitrogen in the soils of the Arkansas valley

    Nitric nitrogen in the soils of the Arkansas valley by Gardner, Robert Alexander

    Published 1934
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  19. 19
    The use of electrodialysis for estimating phosphate availability in calcareous soils

    The use of electrodialysis for estimating phosphate availability in calcareous soils by Goodwin, James B. (James Bennett), 1910-

    Published 1935
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  20. 20
    The use of sugar beet petioles as indicators of soil fertility needs

    The use of sugar beet petioles as indicators of soil fertility needs by Gardner, Robert Alexander

    Published 1935
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