Multituberculates from the Clarkforkian land-mammal age, Late Paleocene-Early Eocene, of western North America / David W. Krause. 1980. Piceoerpeton, a giant Early Tertiary salamander from western North America / Bruce G. Naylor and David W. Krause. 1981. Multituberculates from the Wasatchian land-mammal age, Early Eocene, of western North America / David W. Krause. 1982.