title: Studies of the etiology and epizootiology of lymphosarcoma in northern pike (Esox lucius) and muskellung (Esox masquinongy).
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005393:Fish Diseases / Q000209:etiology* / Q000473:pathology / Q000635:transmission; D005399:Fishes; D008228:Lymphoma, Non-Hodgkin / Q000209:etiology / Q000473:pathology / Q000662:veterinary*; D012190:Retroviridae / Q000302:isolation & purification