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1出版事項 1927### CRL customization ### ?> ### Add publisher and desc details ### ?>Minneapolis, The University of Minnesota press [c1927]viii p., 1 l., 215 p. illus., diagrs. 20 cm.主題: “...Education Congresses....”
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2出版事項 1973### CRL customization ### ?> ### Add publisher and desc details ### ?>Warszawa] Państwowe Wydawn. Naukowe [1973]254 p. ill. 20 cm.主題: “...Educational technology Poland Congresses....”