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  1. 1
    Examining gaps in mathematics achievement among racial-ethnic groups, 1972-1992 /

    Examining gaps in mathematics achievement among racial-ethnic groups, 1972-1992 /

    Published 2005
    Subjects: “…United States History 20th century.…”
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  2. 2
    Patents in the knowledge-based economy /

    Patents in the knowledge-based economy / by Cohen, Wesley Marc

    Published 2003
    Subjects: “…Patents United States 20th century History.…”
    Access full-text online via National Academies Press
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