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  1. 1
    Metric system guide.

    Metric system guide.

    Published 1974
    “…Keller (J.J.) & Associates, inc…”
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  2. 2
    Metric yearbook. Metrication in the United States.

    Metric yearbook. Metrication in the United States.

    “…Keller (J. J.) & Associates, inc…”
    Book

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