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.
Keywords from Image Description:
Mercator and Etzlaub. en This modified version of File shown in other versions which was taken from website wilhelmkruecken de htm On the original image the appended Mercator scale is hardly visible Two clearer scales have been added On the left is version of Mercator adjusted to fit with Erzlaub at degrees The agreement of scale