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| Utgitt
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| Omfang
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| Opplysninger
| "Reprinted from Lethaia, an International Journal of Palaeontology and Stratigraphy, for the participants in the 24th session of the International Geological Congress, Montreal 1972.". - Omslagstit.: An international guide to stratigraphic classification, terminology, and usage : introduction and summary.
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