Resser, C. E. (1939). The Ptarmigania strata of the northwestern Wasatch Mountains. <em>Smithsonian Miscellaneous Collections.</em> 98(24):1-72.[details]
original descriptionResser, C. E. (1939). The Ptarmigania strata of the northwestern Wasatch Mountains. <em>Smithsonian Miscellaneous Collections.</em> 98(24):1-72.[details]
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