title: Studies on helminths of voles in Hokkaido. II. Ecological study.
mesh_terms: D000818:Animals; D001181:Arthropods; D005247:Feeding Behavior; D006373:Helminthiasis / Q000453:epidemiology / Q000469:parasitology; D006374:Helminthiasis, Animal; D006376:Helminths / Q000302:isolation & purification; D007564:Japan; D051379:Mice; D012376:Rodent Diseases / Q000453:epidemiology / Q000469:parasitology*; D012377:Rodentia; D012621:Seasons