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Author - title
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Year
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| details | Ashgillian | Canada(Arctic) | Achab,A. et al. The Laurentian Ordovician chitinozoan zonation: some modifications and some remaining problems. (In: Ordovician from the Andes. G.L.Albanesi,M.S.Beresi,S.H.Peralta,editors) | 2003 | |
| details | Ashgillian | Canada(Quebec) | Achab,A. et al. The Laurentian Ordovician chitinozoan zonation: some modifications and some remaining problems. (In: Ordovician from the Andes. G.L.Albanesi,M.S.Beresi,S.H.Peralta,editors) | 2003 |