People: Aug. 9, 1968

Massachusetts' sky was crisp blue, and a bright sun spilled down on the familiar figure cutting through the ocean on water skis. Just as she has done every day during her six-week stay at the Kennedy compound in Hyannisport this summer, Jackie Kennedy celebrated her 39th birthday skimming over Nantucket Sound. Then she collected an assortment of Kennedy children and treated them to an alfresco picnic on Egg Island, a sand bar that was a J.F.K. favorite during his summer White House days. Came evening, and she was at Father-in-Law Joe Kennedy's house...

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