Mark Callahan

Callahan in 2015 Mark Allen Callahan (born May 11, 1977) is an American information technology consultant and perennial candidate. He was the Republican nominee in the 2016 United States Senate election in Oregon. Provided by Wikipedia
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    Phylogenetic Analysis of the North American Beetle Genus Trichiotinus (Coleoptera: Scarabaeidae: Trichiinae)

    Phylogenetic Analysis of the North American Beetle Genus Trichiotinus (Coleoptera: Scarabaeidae: Trichiinae) by T. Keith Philips, Mark Callahan, Jesús Orozco, Naomi Rowland

    Published 2016-01-01
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