The National Union of Bookbinders and Machine Rulers was formed in January 1911 by the amalgamation of the London Consolidated Society of Journeymen Bookbinders, the Society of Day-working Bookbinders of London, Westminster, etc, the Vellum Binders' Trade Society and the Bookbinders and Machine Rulers' Consolidated Union. In January 1921, it amalgamated with the National Union of Printing and Paper Workers to form the National Union of Printing, Bookbinding, Machine Ruling and Paper Workers.
Women's Section Membership Register
The only source held for this union is the membership register of the Women's Section of the London Branch (MSS.39/SO/B/2/2/1), which lists alphabetically the name, age, trade and date of entrance of members who joined between May 1917 and October 1919.
Note that the Modern Records Centre does not hold any family history sources for other branches of the union.