Public domain photos

The image shows an open book with a drawing of a group of men in uniform standing next to each other. On the right side of the book, there is a color chart with different shades of color, and on the left side, there are words and numbers written on the book.

The image shows an open book with a drawing of a group of men in uniform standing next to each other. On the right side of the book, there is a color chart with different shades of color, and on the left side, there are words and numbers written on the book.Open in library