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56 Šn/57-sep.
AYRTON, William G.
Lower Llandovery of the Northern Appalachians and Adjacent Regions / William G. Ayrton et al. -- S.459-484 : 4 Figs. 6 tbl. -- In: Geological Society of America Bulletin. -- 1969, Vol.80, March. -- separát. -- bibl.. -- Citováno jako: AYRTON, William et al. Lower Llandovery of the Northern... Geol. Soc. Amer. Bull. 1969, Vol.80, March, S.459-484: 4 Figs. 6 tbl.
Lower Llandovery
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61862
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