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PD12M

Open book with a ruler on top of it

The image shows an open book with a ruler on top of it.

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The image shows an open book with a ruler on top of it. The book is open to a page with text, and the ruler is placed at the bottom of the page. The text on the page is visible, and there is a scale beside it.

Credit: Wikimedia Commons
License: https://creativecommons.org/publicdomain/mark/1.0/

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