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Turner, B. L.: The Comps of Mexico. A Systematic Account of the Family Asteraceae. Chapter 19: Subtribe Helianthinae (Part 1 B): Helianthus, Heliomeris, Hymenostephium, Isostephane, Lagascea, Sclerocarpus, Sidneya, Simsia, Tithonia, Vigueira. 2015. 175 p. Paper bd. 59.92 (106227)
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