1. Neil Taylor, "Fort Vermillion Mercy Flight of 1929," Alberta Aviation Museum, 16 January 2019, https://www.albertaaviationmuseum.com/2019/01/16/fort-vermillion-mercy-flight-of-1929/
2. Eugenie Louise Myles, Airborne from Edmonton (Toronto: Ryerson, 1959), 112-16
3. and Frederick B. Watt, "'Wop' May," Maclean's, 1 May 1930, 5, 70-72. The audience was equal to one out of every six Edmontonians at that time.
4. Simon Wells, Balto (London: Amblimation, 1995); and “Balto: The Hero Dog of Nome, Alaska,” Cleveland Museum of Natural History, https://www.cmnh.org/balto, accessed 13 June 2021. See also Edward Butts, “Wop May,” The Canadian Encyclopedia, last modified 23 January 2019, https://www.thecanadianencyclopedia.ca/en/article/wilfrid-reid-may.
5. For diphtheria in the 21st century, see Dora Vargha and Jeremy A. Greene, “Grey-Market Medicines: Diphtheria Antitoxin and the Decay of Biomedical Infrastructure,” The Lancet 389, no. 10080 (2017): 1691–92.