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Three of vast extent have been discovered at Fontanes, Mondoumerc, and Olmie. That of Mondoumerc is cut in the tufa, and is about 20 feet deep. It consists of an infinity of cells, or small chambers, united by a corridor. But the vastest and most remarkable for its extent and the labour devoted on it, is that of Olmie. The chambers are scooped out of a very hard sandstone.
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