The Deltoid Pumpkin Seed

I found this seasonal title in one of my favourite used book haunts - Bookmongers, 439 Coldharbour Lane, Brixton. I shouldn't have been surprised to find that it's actually still in print - it's a fantastical but true story of the making of a prototype flying machine – an orange saucer shaped like a pumpkin seed - built by a well-meaning Presbyterian minister for distributing bread and bibles to the poor.

Now collecting 60s/70s OOP titles for an event on 25/26 October at Designerama, the opening of the new Sackler Centre, V&A, London. Any suggestions?