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
A 3-year-old Standardbred male horse was admitted to Stange Memorial Clinic on March 24, 1949, with a growth protruding from the right nasal passage. History indicated that the growth was first noticed about two weeks prior to arrival at the Clinic. Growth was rapid, resulting in complete obstruction of the right nasal passage.
Giese, K. M.
"Nasal Polypus In The Horse,"
Iowa State University Veterinarian: Vol. 11
, Article 14.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol11/iss3/14