----------------------------------------------------------------------- Pollution by petroleum wastes from refineries has also affected the streams studied. [Please select]
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In Butler County there are four refineries on the Walnut watershed upstream from the area surveyed. [Please select]
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Metzler (1952) noted that "fish-kills" occurred from the mid-1940's until 1952 in connection with wastes periodically discharged from these refineries. [Please select]
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Electrification is essentially completed, and heavy industries, such as fertilizer and assembly plants and oil refineries, now exist. [Please select]
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As charcoal became scarce in England, it was attempted to employ coke in lieu of it, in the refineries. [Please select]
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In the early sixties a score or so of refineries had started in this town, many of which were making large profits. [Please select]
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