M Dusar, M. JM Bless, G Borremans, K Burger, J De Loose, M Fairon-Demaret, P. J Felder, F Gullentops, Lie S F, P Muchez, E Paproth, P Piérart, H. G Rossa, A Smolderen, and Y Somers (1987)
De steenkoolverkenningsboring Gruitrode-Ophovenderheide (boring 172 van het Kempens Bekken)
Geological Survey of Belgium Professional Paper, vol. 1987/3 p. 235.
04296, .63, 063E0224, KB172, Li, VARCAMP, H, PERM, CRET, SON, STRA, COAL, COALI, SEDICL, PALBOT, PETSE, PALMIC, LOG
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