G. T Warwick (1959)
Some observations on by-passed swallow holes in the Meuse and Lesse valleys. In: Colloque international de Spéléologie,Bruxelles 1958
Colloque international de Spéléologie, vol. Mémoires p. 66-72.
16437, 175, 185, N, SYNDIN, QUA, KARST
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