Hermann August Hagen, "Synopsis of the Odonata of North America No. 2. The Genus Anax", Psyche: A Journal of Entomology, vol. 5, Article ID 016707, 6 pages, 1890. https://doi.org/10.1155/1890/16707
Synopsis of the Odonata of North America No. 2. The Genus Anax
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