title: STUDIES ON PUERTO RICAN PHYSIDAE.
mesh_terms: D000818:Animals; D008107:Liver Diseases; D008109:Liver Diseases, Parasitic; D008974:Mollusca; D011647:Puerto Rico; D012756:Sheep; D034561:Sheep, Domestic; D014201:Trematode Infections; D014900:West Indies
keywords: LIVER DISEASES, PARASITIC; MOLLUSCA; PUERTO RICO; SHEEP; TREMATODE INFECTIONS; WEST INDIES