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Radián – Wikipédia
Radián – Wikipédia
Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. Polygnathus prxrTATUS. Hiiide. (Fig. 43.) (Quart. Jour. Geol. Soc, Vol. XXXV., p. 367, PI. XVII.) Distinguishing Characters.—YXni, tliiii, iin.syin- nietrical