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Geology, Stratigraphic --- -Geology, Stratigraphic --- -Paleontology --- -551.924 --- Fossilogy --- Fossilology --- Palaeontology --- Paleontology, Zoological --- Paleozoology --- Historical geology --- Zoology --- Fossils --- Prehistoric animals in motion pictures --- Age of rocks --- Rocks --- Stratigraphic geology --- Physical geology --- Age --- Paleontology --- 551.924 --- Ordovician Period --- Cambrian Period --- PALEONTOLOGIE GENERALE --- PALEONTOLOGIE STRATIGRAPHIQUE --- ORDOVICIEN --- ORDOVICIEN INFERIEUR --- CAMBRIEN SUPERIEUR (SALMIEN) --- PRIMAIRE

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Geology, Stratigraphic --- Geology --- -Geology, Stratigraphic --- -551.924 --- 551.732 --- 55 <7> --- 55 <8> --- <7> --- <7/8> --- Age of rocks --- Rocks --- Stratigraphic geology --- Physical geology --- Geognosy --- Geoscience --- Earth sciences --- Natural history --- Cambrian. 600-490 MYBP --- Earth sciences. Geology. Meteorology etc.--North and Central America --- Earth sciences. Geology. Meteorology etc.--Zuid-Amerika --- North and Central America --- Amerika. Nieuwe wereld --- Age --- 55 <8> Earth sciences. Geology. Meteorology etc.--Zuid-Amerika --- 551.732 Cambrian. 600-490 MYBP --- 551.924 --- Cambrian Period --- 7/8 --- Geology, Stratigraphic - Cambrian --- Geology - America --- CAMBRIEN --- PRIMAIRE --- AMERIQUE DU SUD --- AMERIQUE DU NORD --- ROCHEUSES --- ETATS-UNIS --- CANADA --- ALASKA (ETATS-UNIS) --- GEOLOGIE REGIONALE --- ALASKA