J. WM Jagt (1989)
Ammonites from the early Campanian Vaals Formation at the CPL quarry (Haccourt,Liège,Belgiu) and their stratigraphic implications
Mededelingen Rijks Geologische Dienst, vol. 43,1 p. 1-33.
12445, 107, Lg, MEUSE2, CRET, PAL
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