Author: KEUTGEN, N. ET AL.
Title: Stratigraphy of the upper Vijlen Member (Gulpen Formation; Maastrichtian) in northeast Belgium, the southeast Netherlands and the Aachen area (Germany), with special reference to belemnitellid cephalopods.
Description: 2010. Neth. J. Geosciences 89-2; pp. 109-136, 15 fig./phot./plts. Extract without covers, 4to.

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