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Bulletin of the Department of Secondary-School Principals of the National Education Association
National Education Association of the United States. Department of Secondary-School Principals
出版Department of Secondary-School Principals of the National Education Association, 1969
URLhttp://books.google.com.hk/books?id=A1BZAAAAIAAJ&hl=&source=gbs_api
註釋"Abstracts of unpublished masters' theses in the field of Secondary-School Administration" in no. 24, 34, 36, 39, 43, 47; Jan. 1929; Jan., Apr. 1931; Jan., Dec. 1932; May 1933.