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  1. By: Hopkins, Cyril G. (Cyril George), - Pettit, James Harvey,
    Publication info: Urbana, Ill.,Univ. of Illinois,1905
    Holding Institution: University of California Libraries (archive.org)
  2. By: Brown, Waldo F. (Waldo Franklin), - Crane, Fred R. - Hays, Willet Martin, - Holden, P. G. (Perry Greeley), - Hopkins, Cyril G. (Cyril George), - Shaw, Thomas, - Smith, Clinton De Witt, - Wing, Joseph E. (Joseph Elwyn),
    Publication info: Chicago,International harvester company of America (incorporated)c1906.
    Holding Institution: Library of Congress
  3. By: Hopkins, Cyril G. (Cyril George),
    Publication info: Boston,Ginn,[c1910]
    Holding Institution: University of California Libraries (archive.org)
  4. By: Hopkins, Cyril G. (Cyril George), - Hays, W. M. (Willet Martin), - Holden, P. G. (Perry Greeley), - Wing, Joseph E. (Joseph Elwyn), - Brown, Waldo F. (Waldo Franklin), - Chase, Leon Wilson. - Shaw, Thomas, - Owings, M. R. D. - Buck, J. E.
    Publication info: Chicago[Issued by the I. H. C. service bureau], International harvester company of America (incorpated)c1911.
    Holding Institution: Library of Congress
  5. By: Hopkins, Cyril G. (Cyril George),
    Publication info: Boston,R. G. Badger,1911.
    Holding Institution: Library of Congress
  6. By: Hopkins, Cyril G. (Cyril George),
    Publication info: Boston,Ginn and company,c1912.
    Holding Institution: Library of Congress
  7. By: Hopkins, Cyril G. (Cyril George), - Bauer, F. C. (Frederick Charles), - Mosier, J. G.
    Publication info: Urbana, Ill. :University of Illinois Agricultural Experiment Station,1916.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  8. By: Hopkins, Cyril G. (Cyril George), - Whiting, Albert L. (Albert Lemuel),
    Publication info: Urbana, Ill. :University of Illinois Agricultural Experiment Station,1916.
    Holding Institution: University Library, University of Illinois Urbana Champaign