In 1983, the year in which Dowker died after a long illness, he published a joint paper Classification of knot projections with Morwen B Thistlethwaite.
Sa 1983, ang taon kung saan Dowker namatay pagkatapos ng matagal na karamdaman, siya nai-publish ng isang pinagsamang papel Classification ng buhol projections sa Morwen B Thistlethwaite.