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

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Monthly mortality counts for influenza (squares) and influenza/pneumonia (circles) in the United States plotted over time. Blue indicates the month when strike began mid-month (July 1967). Red indicates full strike months (August 1967–March 1968). Yellow indicates first end-of-strike month (April 1968).