Illustration of salt mining in Dürrnberg (Hallein): vertical and horizontal section of a pit for brine production.
<br>Lithograph
1840-1860 (circa)
<a rel="nofollow" class="external free" href="https://www.britishmuseum.org/collection/object/P_1954-1103-431">https://www.britishmuseum.org/collection/object/P_1954-1103-431</a>