Bricklayers, Masons, and Plasterers International Union of America. Local No. 21 (Chicago, Ill.)

• Constitution, by-laws and arbitration agreements of the United Order American Brick Layers and Stone Masons of the City of Chicago, County of Cook in the State of Illinois, No. 21 of Illinois, of the B.M. and P.I.U., revised and adopted September 20, 1921