Alberta , the center of Canada 's oil industry , introduced a series of laws in the mid-1970 's that essentially give oil and gas leaseholders three years to develop properties or lose their rights .
Canada /location/location/contains Alberta
Canada /location/country/administrative_divisions Alberta
Alberta /location/administrative_division/country Canada
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Canada
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Alberta
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/location/location/contains
Canada
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Alberta
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Alberta
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Canada
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