Free Men vs. The Union Closed Shop
The Marriner S. Eccles Document Collection
Extra edition of the Freeman Magazine, featuring an article by Donald R. Richberg.
Richberg, Donald R., 1951, Free Men vs. The Union Closed Shop, from The Marriner S. Eccles Document Collection, accessed Jul 31, 2014 from FRASER, http://fraser.stlouisfed.org/docs/historical/eccles/030_09_0008.pdf