M Wellens (1992)
Petrological and geochemical investigations on organic matter of pre-Westphalian age (Linksrheinisches Schiefergebirge) - First results. Geological Survey (R.G.D.) Heerlen,May 15-16th,1992
Meuse-Rhine Euregio Geologists Meeting, vol. p. 1 p.
10006, Lg, CALSTAV, SYNVE, CAMB, TN, DEVSUP, COALI, PETCOAL, ORG
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