McElroy, Frank S. (Frank Shafer) , United States. Bureau of Labor Statistics and McCormack, George R. (George Robertson). Injuries and Accident Causes in the Manufacture of Clay Construction Products : Bulletin of the United States Bureau of Labor Statistics, No. 1023 , Washington: U.S. Govt. Print. Off., 1951, https://fraser.stlouisfed.org/title/4421, accessed on September 11, 2024.