Garlough, F. E. (Francis Earl), 1877-; Horn, Everett Ellis, 1896- & Gabrielson, Ira Noel, 1889-. Porcupine control in the western states.. Washington, D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc1544/. Accessed December 11, 2013.
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