Public domain photos

The image shows a black surface with two papers on it, one of which has text written on it and a small piece of paper next to it. The text on the papers appears to be related to the opas gracile, a type of opal found in the Netherlands.

The image shows a black surface with two papers on it, one of which has text written on it and a small piece of paper next to it. The text on the papers appears to be related to the opas gracile, a type of opal found in the Netherlands.Open in library