• 

  Mammal Species of the World - Browse: albus

  http://www.departments.bucknell.edu/biology/resources/msw3/browse.asp?id=14000740

  Mammal Species of the World: Information on albus

• 

  Mammal Species of the World - Browse: hyperborea

  http://www.departments.bucknell.edu/biology/resources/msw3/browse.asp?id=13500035

  Mammal Species of the World: Information on hyperborea

• 

  Mammal Species of the World - Browse: Ochotona

  http://www.departments.bucknell.edu/biology/resources/msw3/browse.asp?s=y&id=13500003

  Mammal Species of the World: Information on Ochotona

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