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1Paris, L'Institut.v. illus. 24 cm.
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2Published 1951### CRL customization ### ?> ### Add publisher and desc details ### ?>Paris, Editions du Centre national de la recherche scientifique [etc.] 1951-85.27 no. ill. 25 cm.
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3[Reston, VA : National Council of Teachers of Mathematics],v. ; 23 cm.ERIC version for July 1982 distributed to depository libraries in microfiche.Also issued online.