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  1. 1
    Ames : Extension Service, Iowa State College,
    v. : ill. ; 28 cm.
    主題: “...Agricultural extension work Iowa Periodicals....”
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  2. 2
    出版 1942
    Ames : Extension Service, Iowa State College, 1942.
    6 v. : ill. ; 28 cm.
    主題: “...Agricultural extension work Iowa Periodicals....”
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  3. 3
    出版 1942
    Ames : Extension Service, Iowa State College, 1942.
    6 v. : ill. ; 28 cm.
    主題: “...Agricultural extension work Iowa Periodicals....”
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  4. 4
    Ames : Extension Service, Iowa State College.
    v. : ill. ; 28 cm.
    主題: “...Agricultural extension work Iowa Periodicals....”
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