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/ServiceNewsletter41.pdf Service Newsletter No 41 – February 1954
https://www.lrsoc.com/forum/forum_files/ServiceNewsletter40.pdf Service Newsletter No 40 – January 1954
