- ZA HPRA AD1137-E-Ef-Ef6-Ef6.1-Ef6.1.1
- Unidad documental compuesta
- 29 March 1961
Also circular issued to all affiliated unions announcing the ban, 1 April 1961. 3p. typescript and Newsletters on the ban, 19 June 1961 (2 pages) and 4 July 1961 (1 page).