This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
BeerAndMadler Quad II. Johann Heinrich von Mdler and Wilhelm Beer quadrant Adler Adler Johann Heinrich von Mdler and Wilhelm Beer Custom marker PDold Beer and Mdler quadrants Uploaded with
Page 2023 Free-images.com. All images are Public Domain