Spurts in Union Growth: Defining Moments and Social Processes

Richard B. Freeman, The Defining Moment: The Great Depression and the American Economy in the Twentieth Century (University of Chicago Press, 1998), chap. 8, https://www.nber.org/books-and-chapters/defining-moment-great-depression-and-american-economy-twentieth-century/spurts-union-growth-defining-moments-and-social-processes.