Research Catalog

  • An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen / by Nabil A. Bibawy and David E. Emerson.

    • Text
    • Washington, D.C. (2401 E St., N.W., MS #9800, Washington 20241) : U.S. Dept. of the Interior, Bureau of Mines, 1990.
    • 1990
  • A method for the calibration of class 2 and class series 4 standards of mass / by Nabil A. Bibawy.

    • Text
    • Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1989.
    • 1989

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