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Bibliography of research studies in education / prepared in the Library Division, Office of Education ; Ruth A. Gray, compiler
(Bulletin / Department of the Interior, Bureau of Education ; 1929, no. 36, 1930, no. 23, 1931, no. 13, 1932, no. 16, 1933, no. 6, 1934, no. 7, 1935, no. 5, 1936, no. 5, 1937, no. 6, 1938, no. 5, 1939, no. 5, 1940, no. 5, 1941, no. 5)

資料タイプ	図書
出版者	Washington : U. S. Gov. Print. Off.
出版年	1930
本文言語	英語
大きさ	v. ; 24 cm