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A descriptive account of a descent made into Penpark-Hole, in the parish of Westbury-upon-Trim, in the county of Gloucester, in the year 1775, now first published: to which is added, a copper-plate engraving of that remarkable cavern. Also, the narratives of Captains Sturmey and Collins, containing their descriptions of the same, in the years 1669 and 1682. / By George Symes Catcott. Public Domain Mark. Source: Wellcome Collection.