L van der Waals, J.M.M van den Broek, J.P Bakker, and E.A Kummer (1962)
The Beaujean sand-pit on the Heerenweg at Heerlen, South Limburg
Mededelingen Geologische Stichting, vol. 15 p. 45-48, Pl 4-11.
19906, RVG, PLIO, 4, CARS, SEDICL, ALTROC, PEDO
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