- T. Thornton (printmaker), Four Quadrupeds (Hogg). Part of Set for Millar's New, Complete, Authentic, and Universal System of Geography (Hogg 1782)
- T. Thornton (printmaker), Four Quadrupeds (The Zebra, The American Buffalo, The Zebul and The many Horned Sheep). In George Henry Millar, The New, Complete, Authentic, and Universal System of Geography: Being a Complete Modern History and Description of the Whole World, London: Alexander Hogg (printer), 1782, p. 328/329 ◼
- T. Thornton (printmaker), Four Quadrupeds (The Zebra, The American Buffalo, The Zebul and The many Horned Sheep) (London, Wellcome Collection) ◼