Showing 1 - 10 results of 20 for search 'Spangenburg, Ray, 1939-', query time: 0.12s Refine Results
  1. 1
    Carl Sagan : a biography /

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  2. 2
    African Americans in science, math, and invention /

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  3. 3
    African Americans in science, math, and invention /

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  4. 4
    Opening the space frontier /

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  5. 5
    Educational software /

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  6. 6
    Carl Sagan : a biography /
    by Spangenburg, Ray, 1939-
    Published 2004

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  7. 7
    Early settlements /
    by Spangenburg, Ray, 1939-
    Published 1998

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  8. 8
    The story of America's canals /
    by Spangenburg, Ray, 1939-
    Published 1992

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  9. 9
    African Americans in science, math, and invention /
    by Spangenburg, Ray, 1939-
    Published 2012

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  10. 10
    Ke xue de lu�� cheng /
    Ke xue de lu�� cheng /
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    by Spangenburg, Ray, 1939-
    Published 2014

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