J.M. Graulish (1966)
Sondage de Francorchamps
Geological Survey of Belgium, vol. 1966/5 - N°5. Professional Paper of the Geological Survey of Belgium.
RBINS Publication(s)
12 pages, 3 figures
http://mars.naturalsciences.be/geology/bibliografie/professional-paper-pdf-files/profpap/pp_66_5.pdf
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