. . . . . "Returns to Seniority in Union and Nonunion Jobs a New Look at the Evidence"@en . . . . . "Returns to seniority in union and nonunion jobs a new look at the evidence"@en . "Returns to Seniority in Union and Nonunion Jobs : A New Look at the Evidence" . . . . . . . "Returns to seniority in union and nonunion jobs : a new look at the evidence"@en . . . . . "National Bureau of Economic Research" . . . .