Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
Spirocerca lupi is commonly known as the esophageal worm of the dog. It occurs in the walls of the esophagus and larger arteries of the dog, fox, wolf and jackal. It is very common throughout the South, particularly in Alabama, Georgia, Florida, Mississippi and probably other states, constituting a formidable menace to the dog.
Starr, L. E.
Iowa State University Veterinarian: Vol. 3
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol3/iss3/2