The Valanginian to Aptian stages - current definitions and outstanding problems
Kawson, Peter Franklin
Article
1982
Zitteliana
10
493--500
BioStor
German
Altötting [etc.], Komissionsverlag Geiselberger [etc.],
BioStor: https://biostor.org/reference/238265
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http://creativecommons.org/licenses/by-nc-sa/3.0/
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