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Geology Dru, Léon (Victor Edmonde) Rapport sur les eaux minérales du Caucase. With 55 partly double leaf g. hand-colored lithographic plates. Paris, Chamerot 1884. 2 sheets, 111 pages. Folio. Red kidskin binding with black RTitel. First edition. - Official report of the geological surveys of the mineral springs of Piatigorsk, Geleznovodsk, Essentouky and Kislovodsk, carried out in 1882 on behalf of the Russian government in the Caucasus. In addition to geological formations, the hand-coloured plates show various plans of wells, bathhouses, pumping stations and other water engineering facilities as well as a double-page colour lithographed map 'Carte géologique de la région du Bechtaou et de la chaîne du Caucase'. First edition. With 55 partly double leaf sized hand coloured lithogr. plates. - Red goatskin binding with black spine title. - Contemp. half morocco, 2 labels and gilt to spine (slight covering losses to back board, slight rubbing). - Owner's inscription to inner board, stamp to title, beautiful copy. *

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