G De Geyter (1985)
Petrographical characterization of siliceous natural building stones in northern Belgium. Proc. Vth Int.Congr. Deterioration and Conservation of Stone,Lausanne September 25-27,1985
International Congress on Deterioration and Conservation of Stone, vol. Vol. 1 p. 3-11.
09397, CAMP3, BRAB3, 3, REC, PIERRE, ALTROC
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