The conservation message in America : a content analysis of periodicals of four major American conservation organizations from 1935 to 1968
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The conservation message in America : a content analysis of periodicals of four major American conservation organizations from 1935 to 1968
[University of Oregon], 1970
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Thesis (Ph. D.)--University of Oregon, [Eugene] , 1969
***記述は遡及データによる
Bibliography: leaves 223-230