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  1. 1
    An analysis of graduate theses in school safety in the United States from 1925 to 1950 /
    by Yost, Charles Peter, 1922-
    Published 1956
    Thesis Book
  2. 2
    Teaching safety in the elementary school.
    by Yost, Charles Peter, 1922-
    Published 1972
    Book
  3. 3
    Teaching safety in the elementary school /
    by Della-Giustina, Daniel
    Published 1991
    Book
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