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Ammonites from the Early Campanian Vaals Formation at the CPL Quarry (Haccourt, Liege, Belgium) and Their Stratigraphic Implications

John W. M. JagtJ. G. M. van de LaarW. J. J. Fermont

出版	Rijks Geologische Dienst, 1989
ISBN	90728690289789072869029
URL	http://books.google.com.hk/books?id=SPFOAQAAIAAJ&hl=&source=gbs_api