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Subtraction shields. (Q193231)

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published work from 1979
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    Subtraction shields.
    published work from 1979

      Statements

      1979
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      Subtraction shields.
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      Catherine Stern.
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      AA195995
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      13Sep79
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      21Sep51
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      Toni S. Gould & Fritz Stern (C)
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      C
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      NM: text & ill.
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      Structural arithmetic
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      Identifiers

      RE033683
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