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         JSTOR Mathematics & Statistics  JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR Mathematics & Statistics  JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         JSTOR (www.jstor.org) is a not-for-profit organization with a dual mission to create and maintain a trusted archive of important scholarly journals, and to provide access to these journals as widely as possible. Content in JSTOR spans many disciplines, primarily in the humanities and social ...  |  
    
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         Knovel provides a one-stop source for finding answers to science and engineering questions.  |