Public domain photos

The image shows an open book with a ruler on top of it. The book is blank, with no writing or illustrations on it, and the ruler is placed next to it, suggesting that it is being used to measure the size of the book.

The image shows an open book with a ruler on top of it. The book is blank, with no writing or illustrations on it, and the ruler is placed next to it, suggesting that it is being used to measure the size of the book.Open in library