United States. Bureau of Labor Statistics , Tillery, Winston L. , Batlin, Carl A. and Hanley, Edward F. Characteristics of Construction Agreements, 1972-73 : Bulletin of the United States Bureau of Labor Statistics, No. 1819 , Washington, D.C: For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1974, https://fraser.stlouisfed.org/title/4669, accessed on December 30, 2024.