Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
United States. Bureau of Labor Statistics and United States. Bureau of Labor Statistics. Industrial Relations Division,"Union wages, hours, and working conditions in the building trades",,"U.S. G.P.O,For sale by the Supt. of Docs., U.S. G.P.O.",1940,Bulletin,,,,https://cir.nii.ac.jp/crid/1130000795156083200