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  1. 1
    Gravimetric preparation of primary standard gas mixtures in the parts per trillion range

    Gravimetric preparation of primary standard gas mixtures in the parts per trillion range by Loya, Ernest W.

    Published 1982
    Book

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  2. 2
    Helium resources of the United States, 1989 /

    Helium resources of the United States, 1989 / by Miller, Richard D.

    Published 1990
    Unknown

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  3. 3
    An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen /

    An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen / by Bibawy, Nabil A.

    Published 1990
    Unknown

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  4. 4
    Isotopic purification of helium by differential distillation below the lambda-point /

    Isotopic purification of helium by differential distillation below the lambda-point / by Tully, Philip C.

    Published 1975
    Book

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  5. 5
    A mass spectrometer method for determining helium in the parts-per-million to 10-percent range /

    A mass spectrometer method for determining helium in the parts-per-million to 10-percent range / by Holland, Philip W.

    Published 1991
    Unknown

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