an (1996)
2nd International Congress on Subterranology. Archeology and History of man-made, man-used underground structures. August 2 to 4, 1997. Mons, Hainaut [announcement]
Miscellanea Geologica, vol. 17, 6, Sept. 1996 p. 8.
22026, 151, Ht, HISTKARST
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