Public domain photos

The image shows an open book with a drawing of a wheel on it. The wheel is composed of several spokes radiating out from the center, and is surrounded by text. The background of the image is dark, giving the wheel a prominent focus.

The image shows an open book with a drawing of a wheel on it. The wheel is composed of several spokes radiating out from the center, and is surrounded by text. The background of the image is dark, giving the wheel a prominent focus.Open in library