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    Report of the Commissioner of Agriculture for the year 1868.

    Published 1869
    Online Access
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    Bulletin of the International Bureau of the American Republics. [Vol. XXVII.] English section.

    Published 1908
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    Sodium sulphate: Its sources and uses, by Roger C. Wells. [U.S. Geological Survey Bulletin 717.].

    Published 1921
    Online Access
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