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J.W.M. Jagt and W.J. Kennedy 2003. First record of Pachydiscus noetlingi Kennedy, 1999 (Ammonoidea) from the Maastrichtian type area (the Netherlands). Netherlands Journal of Geosciences. 82, (Aug. 2003), 303-307. DOI:https://doi.org/10.1017/S0016774600020898.