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Atrichops+hesperius and Naturalists--Colorado and research+notes by Cockerell%25252C%2BTheodore%2BD.%2BA.%2B%252528Theodore%2BDru%2BAlison%252529%25252C%2B1866-1948%25252C%2Bauthor and Cockerell%25252C%2BTheodore%2BD.%2BA.%2B%252528Theodore%2BDru%2BAlison%252529%25252C%2B1866-1948%25252C%2Bauthor
- UC Boulder