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Locarno: Noetzel Edition, [1990]
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[S.l.]: Decca, c 1989
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[Halle/Saale]: MDR Kultur, [2018]
Sächsische Bibliografie
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Novello & Company, Ltd., 1925
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JSTOR, 1917
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JSTOR, 1914
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JSTOR, 1897
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JSTOR, 1925
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National Council of Teachers of Mathematics, 1997
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National Council of Teachers of Mathematics, 1997
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National Council of Teachers of Mathematics, 1997
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National Council of Teachers of Mathematics, 1996
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National Council of Teachers of Mathematics, 1992
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SAGE Publications, 1992
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JSTOR, 1914
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Elsevier BV, 1995
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MPR, 191115
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Wiley, 2001
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American Association for the Advancement of Science (AAAS), 1997
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American Society for the Advancement of Science, 1997