J.M. Graulich (1966)
Sondages dans les sablières du Sart-Tilman
Geological Survey of Belgium, vol. 1966/3 - N°3. Professional Paper of the Geological Survey of Belgium.
RBINS Publication(s)
4 pages, 2 figures
http://mars.naturalsciences.be/geology/bibliografie/professional-paper-pdf-files/profpap/pp_66_3.pdf
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