book
n.— «Matters improved still more. Mr. Legree moved to a job at Public School 150, just across the street from his apartment at Brownsville Houses. It was at that job that he received his “book”—became a member of a laborers’ union.» —“This Hammer for Hire” by Johnny Dwyer New York Times Feb. 4, 2007. (source: Double-Tongued Dictionary)
Further reading
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