https://www.lrsoc.com/forum/forum_files/ServiceNewsletter52.pdf Service Newsletter No 52 – February 1955
https://www.lrsoc.com/forum/forum_files/ServiceNewsletter49.pdf Service Newsletter No 49 – October 1954
https://www.lrsoc.com/forum/forum_files/ServiceNewsletter48.pdf Service Newsletter No 48 – September 1954
https://www.lrsoc.com/forum/forum_files/ServiceNewsletter42.pdf Service Newsletter No 42 – March 1954
