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56 Šn/948-sep.
LUDVIGSEN, Rolf
A trilobite zonation of Middle Ordovician rocks, Southwertern district of Mackenzie / Rolf Ludvigsen. -- 112 s. : il. (fotografie, tabulky, mapy). -- In: Geological Survey Bulletin. -- 312 (1979). -- ISBN 0-660-10165-3. -- s. 1-98
trilobite
Paleontologie
zonation
Middle
Ordovician
Middle Ordovician
Rocks
Southwestern
District
Mackenzie
species
macrofaunal
Ceraurinella
description
56
64213
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