https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13991039Edit ImageSaveSaveEditCropCustom TextSalt mines at Dürrenberg: people standing in the streets near to the track that runs into the mine. Etching.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 877 px | 300 dpiLarge JPEG 3100 x 2266 px | 300 dpiFree DownloadSalt mines at Dürrenberg: people standing in the streets near to the track that runs into the mine. Etching.More