Stevens Memorial Library (North Andover)
Gas wells
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Gas wells
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Gas wells + Hydraulic fracturing + Political aspects
Gas wells + Hydraulic fracturing + Environmental aspects
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Gas wells + Hydraulic fracturing + Environmental aspects -- Pennsylvania -- Amity (Washington County : Township)
Gas wells + Hydraulic fracturing + Political aspects -- Texas
Gas wells + Hydraulic fracturing + Environmental aspects -- Pennsylvania -- Prosperity
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