McElroy, Frank S. (Frank Shafer) , United States. Bureau of Labor Statistics and McCormack, George R. (George Robertson). Work Injuries in Construction, 1948-49 : Bulletin of the United States Bureau of Labor Statistics, No. 1004 , Washington: U.S. Govt. Print. Off., 1950, https://fraser.stlouisfed.org/title/4415, accessed on February 16, 2025.