K.-H Ribbert (1993)
A new map for an old region. Presentation of a new map of the Belgian-German borderland with special respect to the lower Devonian. Leuven - Belgium,4th & 5th June 1993
Meuse-Rhine Euregio Geologists Meeting, vol. p. 1 p.
09978, Lg, ANTARD, SYNVE, CALSTAV, 1, DEVINF, S, EM, HISTCART, STRA
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