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  1. Farm science ...
    By: Brown, Waldo F. - Crane, Fred R. - Hays, Willet Martin, - Holden, P. G. - Hopkins, Cyril G. - Shaw, Thomas, - Smith, Clinton De Witt, - Wing, Joseph Elwyn,
    Publication info: Chicago,International harvester company of America (incorporated)c1906.
    Contributed by: Library of Congress
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  2. For Better crops,
    By: Brown, Waldo F. - Buck, J. E. - Chase, Leon Wilson. - Hays, W. M. - Holden, P. G. - Hopkins, Cyril G. - Owings, M. R. D. - Shaw, Thomas, - Wing, Joseph E.
    Publication info: Chicago[Issued by the I. H. C. service bureau], International harvester company of America (incorpated)c1911.
    Contributed by: Library of Congress
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  3. Laboratory manual for soil fertility by Cyril G. Hopkins and J.H. Pettit.
    By: Hopkins, Cyril G. - Pettit, James Harvey,
    Publication info: Urbana, Ill.,Univ. of Illinois,1905
    Contributed by: University of California Libraries (archive.org)
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  4. Question summary to accompany "Soil fertility and permanent agriculture,"
    By: Hopkins, Cyril G.
    Publication info: Boston,Ginn and company,c1912.
    Contributed by: Library of Congress
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  5. Soil bacteria and phosphates / by Cyril G. Hopkins and Albert L. Whiting.
    By: Hopkins, Cyril G. - Whiting, Albert L.
    Publication info: Urbana, Ill. :University of Illinois Agricultural Experiment Station,1916.
    Contributed by: University of Illinois Urbana Champaign
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  6. Soil fertility and permanent agriculture, by Cyril G. Hopkins ...
    By: Hopkins, Cyril G.
    Publication info: Boston,Ginn,[c1910]
    Contributed by: University of California Libraries (archive.org)
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  7. The story of the soil, from the basis of absolute science and real life,
    By: Hopkins, Cyril G.
    Publication info: Boston,R. G. Badger,1911.
    Contributed by: Library of Congress
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  8. Summary of Illinois soil investigations / by Cyril G. Hopkins, J.G. Mosier, and F.C. Bauer.
    By: Hopkins, Cyril G. - Bauer, F. C. - Mosier, J. G.
    Publication info: Urbana, Ill. :University of Illinois Agricultural Experiment Station,1916.
    Contributed by: University of Illinois Urbana Champaign
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