<https://educationforum.ipbhost.com/topic/19-aviation/page/2/#comment-1179>
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"I visited Robert Tressell’s last surviving relative (Reg Johnson) today. He showed me the Tressell archives. I asked him if he wrote anything else. Apparently, he wrote a great deal but everything bar one article was stolen from Tressell’s daughter when she was Canada. The surviving article (with drawings) was written in 1902 and is called ‘The Evolution of the Airship’. It has never been published but has agreed for it to be used for our Aviation Project. "
<https://educationforum.ipbhost.com/topic/19-aviation/page/2/?tab=comments#comment-695>