Deepest pits bernensium project, Map of the salt mines of Bex, marking of the tunnels, Fig. 5 (Iter 7), to p. 494, 1723, Johann Jakob Scheuchzer: Ouresiphoites Helveticus, sive, itinera per Helvetiae alpinas regiones facta annis MDCCII, MDCIII, MDCCIV, MDCCV, MDCCVI, MDCCVII, MDCCIX, MDCCX, MDCCXI (...). Lugduni Batavorum [Leiden]: typis ac sumptibus Petri van der Aa, MDCCXXIII [1723

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Deepest pits bernensium project, Map of the salt mines of Bex, marking of the tunnels, Fig. 5 (Iter 7), to p. 494, 1723, Johann Jakob Scheuchzer: Ouresiphoites Helveticus, sive, itinera per Helvetiae alpinas regiones facta annis MDCCII, MDCIII, MDCCIV, MDCCV, MDCCVI, MDCCVII, MDCCIX, MDCCX, MDCCXI (...). Lugduni Batavorum [Leiden]: typis ac sumptibus Petri van der Aa, MDCCXXIII [1723]

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Photo credit: © Artokoloro / Alamy / Afripics
License: Licensed
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