Swerdloff, Sol , Winegarden, Calman R. (Calman Robert) , United States. Veterans Administration and United States. Bureau of Labor Statistics. Employment Outlook in Petroleum Production and Refining : Bulletin of the United States Bureau of Labor Statistics, No. 994 , Washington, D.C: U.S. Dept. of Labor, Bureau of Labor Statistics, in cooperation with Veterans Administration, 1950, https://fraser.stlouisfed.org/title/4389, accessed on November 15, 2024.