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- catalog contributor b1430858.
- catalog created "1963.".
- catalog date "1963".
- catalog date "1963.".
- catalog dateCopyrighted "1963.".
- catalog description "Bibliography: leaves 144-148.".
- catalog description "Thesis (Ph.D)--University of Minnesota.".
- catalog extent "x, 230 leaves.".
- catalog issued "1963".
- catalog issued "1963.".
- catalog language "eng".
- catalog subject "Biology Study and teaching (Secondary)".
- catalog subject "Science Study and teaching (Secondary)".
- catalog title "Secondary school biology achievement related to class period length and teaching method / by Roger Gale Olstad.".
- catalog type "text".