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C. F. Helmboldt "AN UNIDENTIFIED PROTOZOAN PARASITE IN THE KIDNEY OF THE GREAT HORNED OWL (BUBO VIRGINIANUS)," Bulletin of the Wildlife Disease Association 3(2), 80, (1 April 1967). https://doi.org/10.7589/0090-3558-3.2.80.a
C. F. Helmboldt "AN UNIDENTIFIED PROTOZOAN PARASITE IN THE KIDNEY OF THE GREAT HORNED OWL (BUBO VIRGINIANUS)," Bulletin of the Wildlife Disease Association, 3(2), 80, (1 April 1967)
