https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14010771![A slate quarry: cross-sections of the galleries. Etching by Bénard.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djdTN2ejlieHctaW1hZ2UuanBn.jpg)
![A slate quarry: cross-sections of the galleries. Etching by Bénard.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djdTN2ejlieHctaW1hZ2UuanBn.jpg)
A slate quarry: cross-sections of the galleries. Etching by Bénard.
A slate quarry: cross-sections of the galleries. Etching by Bénard.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use