"Storm Data: December 1973 Volume 15 No. 12"(PDF). National Centers for Environmental Information. National Oceanic and Atmospheric Administration. p. 2. Archived from the original(PDF) on 15 December 2020. Retrieved 15 December 2020.
"Storm Data: December 1973 Volume 15 No. 12"(PDF). National Centers for Environmental Information. National Oceanic and Atmospheric Administration. p. 2. Archived from the original(PDF) on 15 December 2020. Retrieved 15 December 2020.