Author: Jongmans, W.J., 1953.:
Title: Palaeontological notes on the coalfields of the Province of Gelderland in the Eastern Netherlands. / W.J. Jongmans & S. van der Heide. Palaeontology of the sections in the Lower Westphalian A in borings 66, 67, 68 in Limburg (Voerendaal).
Description: [Meded. Geol. Sticht., Ser. C.] Maastricht: E. van Aelst. 4to. Pp. 58, many photos on 15 pls., 2 fold. pls. of sections in pocket, refs. Orig. wrs.

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