 Further stories of Tyson were written in the early 1990s, with two further volumes of Tyson's adventures appearing in 1992 and 1993.The 'Rynosseros Cycle' would not conclude until publication of the fourth volume in 2007, but stands amongst Dowling's most important work – a major conceptual series achievement in Australian science fiction.The 'Rynosseros Cycle' is set in a far future Australia where great sandships ("charvolants") roam the outback, and the Ab'O tribes control hi-tech and set protocols which restrict the movements of the "Nationals" (white people).