Public domain photos

The image shows a close up of a piece of paper with a black and white image of a rock, which appears to be a micrograph. The background of the image is dark, and at the bottom of the picture there is some text.

The image shows a close up of a piece of paper with a black and white image of a rock, which appears to be a micrograph. The background of the image is dark, and at the bottom of the picture there is some text.Open in library