A Hollerbach and W Kasig (1980)
Organic matter in Paleozoic sediments of the Aachen region; east of the Brabant Massif
Mededelingen Rijks Geologische Dienst, vol. 32-14 p. 106-110.
09569, 227, 228, Lg, SYNVE, CALSTAV, MEUSE2, 1, STRA, ORG
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