K Burger (1982)
UNTERSUCHUNG EINIGER KOHLENTONSTEINE AUS DER WESTFAL C DES CAMPINE-REVIERS IN BELGIEN
Geological Survey of Belgium Professional Paper, vol. 1982/3 N.189 p.
03677, .49, .63, Li, VARCAMP, 1, CARB, H, PETSE, SON, COAL
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