Taxonomic and geographic variation in oviposition by tailed frogs (Ascaphus spp) - Karraker, Nancy; Pilliod, David S.; Adams, M.; Bull, Evelyn; Corn, Paul; Diller, Lowell; Hayes, Marc; Hossack, Blake; Hodgson, Garth; Hyde, Erin; Lohman, Kirk; Norman, Bradford; et al. (Northwestern Naturalist, 2006)