There are a number of union-related microform or print collections available at UW Libraries. You can request these and have them sent to Tacoma.
The Women’s Trade Union League campaigned for the 8 hour work day, safe working conditions and respect for women at work and in society. c. 1900Image from Cornell University, The Triangle Factor Fire
Below are links to online collections of primary sources. Additional primary sources on these events can be located by searching historic newspapers and periodicals.