![PDF) Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian PDF) Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian](https://i1.rgstatic.net/publication/225678061_Volcanic_ash_layers_in_the_Upper_Cretaceous_of_the_Central_Apennines_and_a_numerical_age_for_the_early_Campanian/links/02e7e518802ffabf8b000000/largepreview.png)
PDF) Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian
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