https://www.lrsoc.com/forum/forum_files/ServiceNewsletter54.pdf Service Newsletter No 54 – April 1955
https://www.lrsoc.com/forum/forum_files/ServiceNewsletter47.pdf Service Newsletter No 47 – August 1954
https://www.lrsoc.com/forum/forum_files/ServiceNewsletter41.pdf Service Newsletter No 41 – February 1954