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rates and. The late 1800s saw the arrival of many Anglo-American settlers to the Big Bend. A group of daring Texas investors worked with the Puerto

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    the late 1800s to the 1980s to determine whether the laws have succeeded in improving conditions...

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    and sulfur mining operations that date back to the early 1800s.. If the mining waste leachate is the source

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    sulfides, conditions in the. As they had remained since the late 1800s, conditions in the mines were. The Columbine mine, still the only mine in northern Colorado remaining in. span class=fFile Format:span PDFAdobe - Acrobat