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Good references on education by radio ...

By Koon, Cline Morgan,.
Washington, U.S. Govt. Print. Off., 1932 .
ii, 8 p. 21 x 8 cm..

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The art of teaching by radio,

By Koon, Cline Morgan,.
Washington, U.S. Govt. print. off., 1933 .
vii, 91, [1] p. , At head of title: United States Department of the interior. Harold L. Ickes, secretary. Office of education. William John Cooper, commissioner. 23 cm..

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Sources of visual aids and equipment for instructional use in schools,

By Koon, Cline Morgan,.
Washington, U.S. Govt. Print. Off., 1937 .
iii, 44 p. , Later edition by U.S. Office of Education. 23 cm..

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School use of visual aids; an interpretative study of the data collected in the national survey of visual instruction in elementary and secondary schools,

By Koon, Cline Morgan,.
[Washington, U.S. Govt. print. off., 1938 .
viii, 68 p. , "The survey was made by the Office of education with the cooperation of the American council on education, in 1936." -- Foreword. 23 cm..

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