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  1. Analyses of natural gases, 1994-95
    By: Hamak, John E. - Driskill, D. L.
    Publication info: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Land Management, [1996]
    Contributed by: Bureau of Land Management (archive.org)
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  2. Analyses of natural gases, 1996-97
    By: Gage, B. D. - Driskill, D. L.
    Publication info: Amarillo, Tex. (801 S. Fillmore, Suite 500, Amarillo 79101-3545):U.S. Dept. of the Interior, Bureau of Land Management, Helium Operations,[1998]
    Contributed by: Bureau of Land Management (archive.org)
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