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. 2007 Jan 4;115(5):679–683. doi: 10.1289/ehp.9762

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Monthly mortality counts for the four Southwest states plotted over monthly mortality counts for bordering states. The blue dot indicates the month when strike began mid-month (July 1967). Red dots indicate full strike months (August 1967–March 1968). Yellow dot indicates first end-of-strike month (April 1968). The line is a quadratic regression line fit through the data.