Siegfried Ritzkowski (1980)
Exkursion "Boom Clay (Rupelian) in Belgium" 28./29.Mai 1979. In: Project 124. The Northwest European Tertiary basin. R. Vinken,ed. Edited in cooperation with the IGCP-National Committee of France
IUGS UNESCO IGCP, vol. Report No. 6February 1979 p. 132-136.
18861, .42, .58, O, A, BRAB3, OLIG, LIVEX, PALMIC
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