@misc{https://doi.org/10.3932/ethz-a-000539635,<br/><span class="tab"></span>
  doi = {10.3932/ETHZ-A-000539635},<br/><span class="tab"></span>
  url = {https://ba.e-pics.ethz.ch/catalog/ETHBIB.Bildarchiv/r/628087},<br/><span class="tab"></span>
  author = {{Bärtschi,<br/><span class="tab"></span> Hans-Peter}},<br/><span class="tab"></span>
  language = {de},<br/><span class="tab"></span>
  title = {Engi,<br/><span class="tab"></span> Bergwerk,<br/><span class="tab"></span> Schieferabbau,<br/><span class="tab"></span> Landesplattenberg,<br/><span class="tab"></span> Stolleneingang der oberen Kavernen},<br/><span class="tab"></span>
  publisher = {ETH-Bibliothek Zürich,<br/><span class="tab"></span> Bildarchiv},<br/><span class="tab"></span>
  year = {1992}
}