Roger Nijs (1992)
Natural Ledger Stones in Flanders
Mineralogia Polonica, vol. 23 p. 61-73.
26534, 124, 144, Ht, N, SYNAM, TOURN, TN, V, PIERRE
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Roger Nijs (1992)
Mineralogia Polonica, vol. 23 p. 61-73.
Document Actions